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1.
Four different kinds of water treatments were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings in the environment of the Three Gorges hydro-fluctuation belt. The four kinds of water treatments were: normal
growth water condition (CK), light drought stress (T1), soil water saturation (T2), and soil submersion (T3). The results
showed that different water treatments could effectively influence the content of the photosynthetic pigment, leaf gas exchange
and apparent resources use efficiency of T. ascendens seedlings. It was also demonstrated that the T. ascendens seedlings could not only tolerate water submersion and wet conditions but also endure a certain degree of drought. To establish
a protection forest system in the hydro-fluctuation belt in the Three Gorges Reservoir Area, the species T. ascendens is suitable for planting in conditions of root submersion or water-saturated soil. In case it is planted in drought conditions,
this tree species should be watered appropriately in order to keep its normal net photosynthetic rate.
Translated from Forest Research, 2006, 19(1): 54–60 [译自: 林业科学研究] 相似文献
2.
[目的]以越南多毛金花茶(Camellia hirsuta Hakoda et Ninh)为实验材料,开展不同光照处理对多毛金花茶光合特性、叶解剖结构及光合色素含量的影响研究,为越南金花茶引种栽培和抚育管理提供理论依据。[方法]于2017年5月上旬,将越南多毛金花茶置于不同光照强度(10%、20%、30%、40%、50%,通过覆盖不同层数的遮荫网获得)的遮荫棚内生长,处理时间2个月。[结果]不同光照处理下,多毛金花茶净光合速率日变化趋势不同,20%、30%光照处理显著提高了多毛金花茶叶片净光合速率、蒸腾速率,同时蒸汽压亏缺降低,促进光合作用的进行,达到显著差异(P0.05);在30%光照处理下,光合色素的含量最高,而叶绿素a/b的值最低,30%光照更有利于多毛金花茶叶片中叶绿素b的合成。20%、30%光照处理下的多毛金花茶叶片具有更发达的栅栏组织、海绵组织及更厚的叶片厚度,这2个处理的叶片结构可能有利于其对环境的适应并且光合能力更强。在适当的遮荫条件20%～40%光照处理下,多毛金花茶的最大净光合速率增大。[结论]在20%、30%光照处理下,其叶片具有更发达的叶片厚度和栅栏组织,气孔密度相对较低,净光合速率、蒸腾速率得到提高,胞间CO_2浓度和蒸汽压亏缺降低,CO_2和水蒸气进出气孔阻力变小,同时在30%光照处理下光合色素的含量最高,说明光合速率得到有效提高。越南多毛金花茶适宜在20%～30%光照强度的环境下生长。 相似文献
3.
[目的]探寻适合油茶苗培育的最佳LED光质配比。[方法]以2年生长林4号油茶扦插苗为试材,LED白光为对照,研究LED红光、蓝光及其复合光对油茶苗生长和光合特性的影响。[结果]表明:L1(红光)处理下,油茶苗高生长量最大,但表观量子效率、光补偿点和胞间CO2浓度最小;L7(蓝光)处理下,油茶苗光补偿点最高,但高生长量、干物质含量、壮苗指数、气孔导度和蒸腾速率最小;L6(10%红光+90%蓝光)处理下,油茶苗地径生长量、干物质含量、壮苗指数、光合色素含量、表观量子效率、最大净光合速率、暗呼吸速率、气孔导度、蒸腾速率、实际光能转换效率和相对电子传递速率均最大;L4(50%红光+50%蓝光)处理下,油茶苗地径生长量、光合色素含量、最大净光合速率、实际光化学效率和相对电子传递速率均最小,且非光化学淬灭系数最大。[结论]与对照及其它处理相比,L6(10%红光+90%蓝光)处理更利于长林4号油茶苗生长和光合能力的提高,是培育油茶壮苗较为理想的光质。 相似文献
4.
目的]以白榆幼苗为材料,研究不同浓度水杨酸(SA)的喷施对盐胁迫下白榆生理代谢的影响。[方法]以1年生白榆品种‘白洼一号’幼苗为材料,在0、50、100和150 mmol·L~(-1)Na Cl浓度下,喷施不同浓度SA(0、0.5、1.0、2.0 mmol·L~(-1)),处理30 d后对白榆水分生理、膜脂过氧化、光合色素含量和光合气体交换参数进行测定。[结果]表明:(1)盐胁迫下,外源SA可以显著提高白榆叶片相对含水量、可溶性糖含量,并降低丙二醛含量,但对电解质渗透率影响不显著。(2)0.5和2.0 mmol·L~(-1)SA会显著提高50和100 mmol·L~(-1)Na Cl胁迫下白榆叶片的光合色素含量,1.0 mmol·L~(-1)SA对各盐浓度下光合色素含量改善作用均不明显。(3)2.0 mmol·L~(-1)SA的添加提高了盐胁迫下白榆光合气体交换参数,1.0 mmol·L~(-1)SA明显降低了50 mmol·L~(-1)盐浓度下白榆叶片的净光合速率和气孔导度。[结论]适宜浓度的SA能改善白榆的生理参数,隶属函数法综合评价表明:0.5和2.0 mmol·L~(-1)SA对盐胁迫下白榆生理参数的改善作用较明显。 相似文献
5.
Two-year-old seedlings ofPinus koraiensis, Pinus sylvestriformis andFraxinus mandshurica were treated in open-top chambers with elevated CO2 concentrations (700 μL·L−1, 500 μL·L−1) and ambient CO2 concentrations (350 μL·L−1) in Changbai Mountain from June to Sept. in 1999 and 2001. The net photosynthetic rate, dark respiration rate, ribulose-1,5-bisphosphate
carboxlase (RuBPcase) activity, and chlorophyll content were analyzed. The results indicated the RuBPcase activity of the
three species seedlings increased at elevated CO2 concentrations. The elevated CO2 concentrations stimulated the net photosynthetic rates of three tree species exceptP. sylvestriformis grown under 500 μL·L−1 CO2 concentration. The dark respiration rates ofP. koraiensis andP. sylvestriformis increased under concentration of 700 μL·L−1 CO2, out that ofF. mandshurica decreased under both concentrations 700 μL·L−1 and 500 μL·L−1 CO2. The seedlings ofF. mandshurica decreased in chlorophyll contents at elevated CO2 concentrations.
Foundation item: This paper was supported by the National Natural Science Foundation of China (No. 30070158). Knowledge Innovation Item of
Chinese Academy of Sciences (KZCX2-406) and “Hundred Scientists” Project of Chinese Academy of Sciences.
Biography: Zhou Yu-mei (1973-) Ph. Doctor, Assistant Research fellow Institute of Applied Ecology. Chinese Academy of Sciences. Shenyang
110016. P.R. China.
Responsible editor: Song Funan 相似文献
6.
Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes 总被引：3，自引：0，他引：3
Daily net canopy photosynthesis (P
n) was predicted for cocksfoot (Dactylis glomerata L.) canopies grown under different light regimes by integration of a leaf photosynthesis model developed for the light-saturated
photosynthetic rate (P
max), photosynthetic efficiency (α) and the degree of curvature (θ) of the leaf light–response curve. When shade was the only
limiting factor, the maximum P
n (P
nmax) was predicted to decrease approximately linearly from 33.4 g CO2 m−2 d−1 to zero as photosynthetic photon flux density (PPFD) fell from full sunlight (1800 μmol m−2 s−1 PPFD) to 10% of this in a fluctuating light regime. It was also predicted that at 50% transmissivity P
nmax was higher for a continuous light regime (10.4 g CO2 m−2 d−1) than for a fluctuating light regime with the same intensity (8.4 g CO2 m−2 d−1). The canopy photosynthesis model was then used to predict dry matter (DM) production for cocksfoot field grown pastures
under a diverse range of temperature, herbage nitrogen content and water status conditions in fluctuating light regimes. This
prediction required inclusion of leaf area index and leaf canopy angle from field measurements. The model explained about
85% of the variation in observed cocksfoot DM production for a range from 6 to 118 kg DM ha−1 d−1. The proposed model improves understanding of pasture growth prediction through integration of relationships between shade
limitations in fluctuating light regimes and other environmental factors that affect the canopy photosynthetic rate of cocksfoot
pastures in silvopastoral systems. 相似文献
7.
目的]探究抑制剂对大叶黄杨生长的抑制作用以及对其叶片形态和光合作用的影响,为灌木绿篱的化学修剪提供技术指导。[方法]在北京林业大学林场苗圃采用3种生长抑制剂(多效唑(PP_(333))、三碘苯甲酸(TIBA)以及脱落酸(ABA))对密植成绿篱状的1年生大叶黄杨扦插苗进行叶面喷施,对其生长、叶片形态及光合作用等指标进行测定。[结果]3种抑制剂均有矮化植株、抑制新梢生长的作用,矮化效果最佳、抑制作用最强的为PP_(333),且高浓度PP_(333)对于高生长的抑制作用持效性较长。叶宽、叶厚以及叶面积在短期PP_(333)处理下高于对照。PP_(333)能提高大叶黄杨净光合速率,主要通过增加叶厚、气孔导度、叶肉导度及叶绿素含量来实现,并且PP_(333)使蒸腾速率提高的同时降低了水分利用效率。TIBA有显著减小叶长、叶宽的作用,但能使叶厚增加,且随浓度的增加作用效果增强,主要通过减小叶面积,降低叶肉导度、气孔导度、胞间CO_2浓度及叶绿素含量来降低净光合速率。ABA能增加叶面积(10 mg·L~(-1)处理除外)、叶长以及减小叶片厚度,通过抑制气孔导度、叶肉导度、叶绿素含量降低净光合速率。TI-BA及ABA均通过降低蒸腾速率,使水分利用效率提高。[结论]3种抑制剂均有矮化植株、抑制新梢生长的作用,并且影响叶片发育,进而影响叶片光合作用,且800 mg·L~(-1)的多效唑对大叶黄杨具有较好的正向作用。 相似文献
8.
Weiqiang Zhang Kangning He Yunqi Wang Baitian Wang Juntao Deng Yi Zhou Xijun Zhong Zhaoqing Li 《Frontiers of Forestry in China》2007,2(2):192-197
In order to offer a scientific basis for cultivation and management of forests, effects of light radiation intensity on photosynthetic
characteristics and water use efficiency of Platycladus orientalis and Pinus tabulaeformis were studied under different soil moisture contents. By adopting artificial control methods to soil moisture, and under simulated
photosynthetic radiation (SPR), the net photosynthetic rate (P
N), transpiration rate (T
r), water use efficiency (WUE) and intercellular CO2 concentration (C
i) of Platycladus orientalis and Pinus tabulaeformis in the semi-arid region of the Loess Plateau, were studied. Results are as follows: within the photon range of 0–2,200 μmol/(m2·s), P
N, T
r and WUE were enhanced with an increase in SPR in both species. P
N and WUE of Platycladus orientalis and Pinus tabulaeformis, however, declined with continued increase in SPR. P
N, T
r, WUE and light saturation point (LSP) of Platycladus orientalis were higher than those of Pinus tabulaeformis, while light compensation point (LCP) of Platycladus orientalis was lower than that of Pinus tabulaeformis at the same soil moisture content. The efficiency of light energy utilization of Platycladus orientalis was higher than that of Pinus tabulaeformis; P
N, T
r and C
i of Platycladus orientalis and Pinus tabulaeformis were enhanced by increasing soil moisture content, whereas WUE declined. At soil moistures of 7.90%, 13.00% and 19.99%, LSP of Platycladus orientalis was 1,275, 1,450 and 1,675 μmol/(m2·s) respectively, and LCP was 42, 25 and 13 μmol/(m2·s) respectively, with corresponding maximal net CO2 photosynthetic rates (P
max) of 3.04, 4.06 and 5.53 μmol/(m2·s). At soil moistures of 7.83%, 13.04% and 20.15%, the LSP of Pinus tabulaeformis was 1,100, 1,325 and 1,500 μmol/(m2·s) respectively, and LCP was 60, 30 and 23 μmol/(m2·s), with P
max of 1.08, 3.35 and 4.36 μmol/(m2·s) respectively.
__________
Translated from Science of Soil and Water Conservation, 2006, 4(3): 108–113 [译自: 中国水土保持科学] 相似文献
9.
目的]比较日本落叶松不同冠层和方位光合生理参数的差异,探讨冠层及方位变化对光合生理参数的影响,为构建冠层生产力模型及估算冠层生产力提供理论参考。[方法]以7年生和19年生日本落叶松单木为研究对象,将树冠分为上、中、下3层,东、西、南、北4个方位,测定冠层每一部位的光响应曲线、CO_2响应曲线和光合色素含量,并分析不同冠层及方位的光合生理特性。[结果]表明:垂直方向上,2种林龄样木冠层对大多数光合生理参数影响显著;最大净光合速率(A_(max))、光饱和点(LSP)、光补偿点(LCP)和暗呼吸速率(R_d)随冠层的升高而增大;最大羧化速率(V_(max))、最大电子传递速率(J_(max))、磷酸丙糖利用率(TPU)和羧化效率(CE)均为下冠层最小,而CO_2补偿点(CCP)均为冠层下部最大;不同冠层针叶光合色素含量差异显著,且叶绿素a(Chla)、叶绿素b(Chlb)和类胡萝卜素(Car)均随冠层的升高而降低。水平方向上,方位对2种林龄树木光合生理参数均影响不显著,南向和东向光合参数均值分别反映了7年生和19年生样木全冠层的光合特性。光合生理参数在林龄间无显著差异。[结论]日本落叶松冠层光合生理参数具有空间异质性,冠层对树木多数光合生理参数的影响显著,而方位和林龄对以上参数影响不显著。 相似文献
10.
在乌兰布和沙漠地区,研究了中沙冬青、梭梭、白刺、霸王、柠条等5种沙生灌木的生理生长指标的差异性,结果表明:这些灌木树种的净光合速率、气孔导度、蒸腾速率、水分利用效率等气体交换特征和株高、地径、冠幅等生长指标在不同起源之间均具有显著差异,且人工起源植株的气体交换特征均比天然起源植株的大,而生长指标则均比天然起源植株的小;天然林和人工林中不同树种的水分利用效率的差异均不显著,但不同树种的净光合速率、气孔导度、胞间CO2浓度、蒸腾速率等气体交换特征和株高、地径、冠幅等生长指标差异却很显著.在测定光响应曲线和CO2响应曲线基础上求算出的最大光合速率、表观量子效率、光补偿点、光饱和点、暗呼吸速率、CO2补偿点和羧化效率等光合响应曲线参数在不同树种以及不同起源之间的变化也很大,并据此提出不同树种的人工林栽培及天然林保护措施. 相似文献
11.
Seasonal changes in carbon isotope discrimination (Δ) and gas exchange traits were assessed in four Populus×euramericana clones differing in growth potential. Measurements were made during the second year after establishment in the field under
two watering regimes, which were defined by the time-span between flood irrigations, hence resulting in different dry-down
cycles: high irrigation (conservative schedule currently applied in the Ebro Valley, Spain) and low irrigation (equivalent
to about a one-fourth reduction in water inputs). Net CO2 assimilation rate (A), stomatal conductance (gs), intrinsic water-use efficiency (A/gs) and other related photosynthetic traits (leaf nitrogen concentration, leaf greenness and leaf mass per area) were measured
prior to watering, and Δ was analysed in water-soluble leaf extracts (Δs) and bulk leaves (Δl). Stem growth was monitored over 3 years starting at the year of establishment (1998). Data were subjected to a repeated
measures ANOVA over time for a randomised block split-plot design across watering regimes. Significant differences between
watering regimes were detected using a long-term estimate of photosynthetic performance such as Δl, in agreement with changes in soil water status and evapotranspirative demand. However, the lack of significant genotype×watering
regime interactions for gas exchange traits and Δs suggested that water shortage imposed by low irrigation was not sufficient to reveal physiological adaptations to drought.
In this regard, the reduction in water inputs brought about by low irrigation did not reduce tree growth for any of the clones,
suggesting that the current irrigation scheme employed in the region is superfluous to the water consumption needs of poplars.
Genotypic variation was detected in gas exchange traits, Δs, Δl and stem growth under both watering treatments. Significant correlations with stem volume for Δs (r = −0.60, p<0.05) and A (r = + 0.61, p<0.05) suggested that growth was improved by higher water-use efficiency (the ratio of carbon fixed to water lost, as inferred
by Δs) due to variation in A rather than in gs. This observation corroborated the expectation derived from current theories that a lower Δ is related to higher stem volume,
as a result of changes in net CO2 assimilation rates. 相似文献
12.
Containerized seedlings of three commercially important tropical species were grown under four different light treatments
[i.e., 100 (open site), 45, 22 and 10% sunlight] for 130 days. Light-saturated photosynthesis (A
max) and light saturation estimates (LSE) reflected the species successional status with Terminalia superba Engl. and Diels, the pioneer species showing largest mean A
max and LSE at 100% sunlight, whereas at 10% sunlight, it showed the lowest A
max and LSE. At 22% sunlight, Cedrela odorata L., an intermediate successional species had greater A
max and LSE than Mansonia altissima A. Chev., a non-pioneer light demander and T. superba. T. superba had the lowest relative growth rate (RGR) at 10% sunlight and greatest net assimilation rate (NAR) at 100% sunlight; although
a higher RGR at this light level was not seen for this species. Strong and positive linear mean A
max–mean NAR relationship of C. odorata and T. superba indicated that differences in leaf photosynthetic rates of the two species were reflected in their NAR, which increased with
increasing light. At final harvest, superior biomass production was found at 45% sunlight for all the species. Seedling responses
in specific leaf area, leaf area ratio, leaf mass ratio and root mass ratio were typically those found along a light gradient.
At the 100% sunlight, intrinsic water-use efficiency (WUE), F
v/F
m and final root system of the plants was generally superior in T. superba but at 10% sunlight, WUE was inferior in T. superba when compared to C. odorata and M. altissima, reflecting the respective species’ short-term acclimation to high or low light. Results of this study may have practical
use in screening tropical tree species for use in plantation forestry. 相似文献
13.
14.
温度对大叶桃花心木(Swietenia macrophylla King)幼苗叶片的光合影响 总被引：2，自引：0，他引：2
本文研究了大叶桃花心木（Swietenia macrophylla King）一年生幼苗在经过夜温处理后的光响应曲线和在饱和光强下的CO2反应曲线.结果表明:在大气CO2浓度下,叶片的最佳光合作用温度在25-31℃之间,而在饱和CO2浓度下为31-35℃.在25℃以下光合速率开始降低,主要是由于羧化效率的降低,而当温度超过31℃时,光合速率下降,是因为羧化效率的降低和呼吸速率的增加.CO2浓度对光合的促进作用在低温下受到抑制,这意味着未来在CO2浓度增高的情况下,高浓度的CO2对热带常绿植物光合的促进在冬天低温情况下表现不十分明显.图4参23. 相似文献
15.
以该区年龄相同的5种主要植被恢复树种车桑子、滇柏、侧柏、花椒和香樟幼苗为研究对象,通过盆栽控水试验,测算其在不同水分梯度下的叶绿素相对含量、净光合速率、蒸腾速率、气孔导度、胞间CO2浓度以及水分利用效率等生理生态指标,系统比较各参数的适应性变化及其差异性分析,结果表明：（1）随着干旱胁迫的加剧,5种幼苗叶片叶绿素相对含量呈现不同的变化趋势,车桑子逐渐降低,侧柏和滇柏先降后升,花椒和香樟先升后降;（2）各光合生理生态参数也呈现不同的变化规律：随干旱胁迫的加剧,净光合速率、蒸腾速率、气孔导度均逐渐降低,且在中度和重度干旱胁迫时极显著降低,其中在重度干旱胁迫时,侧柏的净光合速率最低比对照下降了100.5%,下降幅度最大;胞间CO2浓度在轻度干旱胁迫时下降,中度和重度干旱胁迫时上升;水分利用效率在轻度和中度干旱胁迫时增加,重度干旱胁迫时下降,其中香樟的水分利用效率在重度干旱胁迫时仍是对照的1.05倍;（3）综合分析各项生理生态参数,5种幼苗均能耐受一定程度的干旱胁迫,但香樟的控水耐旱能力明显高于其它4种树种,更能适应石漠化地区的生态环境。 相似文献
16.
Gonzalo Caballé María Elena Fernández Javier Gyenge Alejandro Aparicio Tomás Schlichter 《Agroforestry Systems》2011,83(1):13-24
The integrated relationship in a simple mechanistic model between the critical environmental factors controlling leaf photosynthesis
of understory species would be a useful tool to optimize the management of the silvopastoral systems. Individual effect of
leaf temperature, water stress and light environment over net maximum photosynthetic rate (Pmax) was evaluated on Festuca pallescens leaves grown in a silvopastoral system of two Pinus ponderosa canopy covers (350 and 500 trees ha−1) and natural grassland. The aim was to integrate individual functions for Pmax against these environmental factors into a multiplicative model. We measured pre-dawn water potential (ψ
pd), leaf temperature and net photosynthetic rate (Pn), stomatal conductance (gs) and intercellular CO2 concentration (Ci) as a function of photosynthetic photon flux density (PPFD). The highest Pmax under non-limiting conditions was 20.4 μmol CO2 m−2 s−1 and was defined as standardized dimensionless Pmax
s
= 1 for comparison of environmental factors. The leaf temperature function showed an optimum range between 20.2 and 21.8°C
where Pmax
s
= 1. Then, Pmax
s
declined by an average 1 μmol CO2 m−2 s−1 C−1 from the optimum to 4.7 and 38.5°C. Pmax
s
decreased at a rate of 9.49 μmol CO2 m−2 s−1 MPa−1 as water potential reaches −1.9 MPa and showed a lower slope as water potential decreased down to −4.3 MPa. The light environment
was estimated from hemispherical photograph analysis. Pmax
s
was 20% higher in leaves of open control plants than under the maximum tree canopy cover. The simple multiplicative model
accounted for 0.82 of the variation in Pmax. Such a simple mechanistic model is the first step towards a more effective decision support tool. 相似文献
17.
比较分析了地涌金莲原种及红苞地涌金莲变种的光响应和CO2响应特征以及叶绿素含量等指标.结果表明:(1)在Pn-PAR中,地涌金莲原种的最大光饱和净光合速率、光补偿点和暗呼吸速率分别较红苞变种高20.42％、34.88％、31.95％,而光饱和点却较红苞变种低4.95％;Pn-Ci响应的各参数中,原种的光呼吸速率、CO2饱和最大净光合速率以及羧化效率分别高于红苞变种2.73％、14.79％、21.35％,说明地涌金莲的光合能力要强于红苞地涌金莲;(2)地涌金莲具有典型的C3植物特征;(3)地涌金莲为阳性耐荫植物;(4)地涌金莲的叶绿素a、b以及a/b的含量分别高于红苞地涌金莲22.60％、32.46％、25.06％. 相似文献
18.
Natalia S. A. Feijó Marcelo S. Mielke Fabio P. Gomes Solange Fran?a Alyne O. Lavinsky 《Agroforestry Systems》2009,77(1):49-58
We analyzed the growth and photosynthetic behavior of Gallesia integrifolia (‘pau-d’alho’) and Schinus terebinthifolius (‘aroeirinha’) under shade, seeking to obtain ecophysiological information for introducing seedlings of those species in
previously established cacao agroforestry systems. Considering that light intensity under the shade of cacao trees varied
between 5 and 10% daylight, 5 months old seedlings were exposed to four irradiance levels (25, 17, 10 and 5% daylight) for
92 days. With shade increase both species displayed trends of decrease leaf mass per unit leaf area, leaf area per plant (LA),
relative growth rate (RGR) and net assimilation rate (NAR), and increase leaf area ratio (LAR). The mean values of light-saturated
net photosynthetic rate (P
nmax) in 25 and 5% daylight were 12.8 and 8.0 μmol CO2 m−2 s−1 for G. integrifolia and 17.9 and 7.4 μmol CO2 m−2 s−1, respectively, for S. terebinthifolius. Based on the measurements of photosynthetic photon flux density and estimated values of photosynthetic saturated irradiance
(Is) we concluded that, in all shaded conditions, the leaves of both species were under sub optimal light conditions to reach
P
nmax. In spite of the lowest P
nmax values, RGR and NAR were significantly higher for G. integrifolia in all irradiance levels. Differences in growth rates can be explained by the higher values of LA, LAR and leaf mass ratio
(LMR), as well as by the lower values of Is, photosynthetic compensation irradiance and dark respiration rates observed for
G. integrifolia. Even though seedlings of G. integrifolia presented higher capacity to adapt under conditions of dense shade, we concluded that both species were under stress conditions
induced by shade in light environments below 25% daylight. On a practical point of view it is possible to conclude that seedlings
of both species should be introduced in light gaps, formed after the fall of big trees, or in places in which cacao trees
are cultivated using large plant spacing. 相似文献
19.
20.
以辽宁大孤家杂种实生采穗园中的采穗母株为研究材料,对3个不同母本与同一多父本混合花粉杂交组合家系及3个同一母本与不同单一父本杂交组合家系进行了光响应曲线及CO2响应曲线的测定,以分析父母本对日本落叶松×长白落叶松杂种光合性状的影响。结果表明:不同母本与同一多父本混合花粉杂交组合间的表观量子效率、暗呼吸速率、羧化效率存在显著差异,光补偿点、CO2补偿点存在极显著差异,其他指标差异不显著,表现出较强的母本效应;同一母本与不同父本杂交组合间只有暗呼吸速率差异极显著,其他指标差异不显著,表现出较弱的父本效应。在高光效亲本选择时,应特别重视母本对杂种的影响。 相似文献