共查询到18条相似文献，搜索用时 156 毫秒
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毛白杨无性系叶面积的回归测算 总被引：1，自引：0，他引：1
利用快速、精准的方法,建立了4个不同毛白杨无性系的叶面积与其叶长、叶宽、以及叶长×叶宽之间的线性回归和幂函数回归方程。结果表明：1）毛白杨不同的无性系叶形指数差异较大,不同无性系的回归方程也不一样,应针对无性系计算叶面积;2）叶片生长的不同阶段叶面积的回归方程不同,因此应针对叶片的不同生长阶段确定回归方程。3）一元线性回归方程中,叶面积和叶长、叶宽的乘积的相关性最好,但只适用于功能叶片的测量;而幂函数回归方程无叶片大小限制,叶面积和叶宽的相关性较好并且测量方便,毛白杨无性系50号叶面积和叶宽幂函数回归方程为LA=1.0014×W1.8295,83号回归方程为LA=0.863×W1.832,30号回归方程为LA=0.554×W2.051,B331号回归方程为LA=1.639×W1.600。因此在今后的生产实践中,可通过测定4个毛白杨无性系的叶宽,利用其幂函数回归方程,估算叶面积。 相似文献
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为快速获取大田油菜长势监测信息,针对不同栽种方式和施肥水平对油菜叶片生长的影响,建立单株油菜叶面积和叶鲜重估计模型。分别于2013—2015年的2个油菜种植季,设置不同施肥水平下直播和移栽油菜试验小区。在油菜叶片形态差异最大的六叶期和蕾薹期,测量样株所有叶片的长、宽、面积和鲜重,采用方差分析对比栽种方式和施肥水平对油菜叶片生长的影响,运用麦夸特法+通用全局优化法建立叶面积和叶鲜重的长宽估计模型。在不同施肥水平和栽种方式下,2个生长期的油菜叶面积和叶鲜重与叶宽关系均比叶长更明显;相同条件下蕾薹期油菜叶片变异程度比六叶期要大,2个时期不同施氮水平、栽种方式下油菜叶面积、叶鲜重差异均达到极显著水平,但两者对叶片的交互作用未达到显著水平。叶宽线性模型估算叶面积和叶鲜重的预测R2为0.89、0.84,RMSEP为32.40 cm2、2.54 g,长宽幂函数模型与常规的长宽线性模型相比,叶面积和叶鲜重的预测R2为0.97、0.94,RMSEP为 12.92 cm2、0.86 g。不同生长条件下,叶宽线性模型可用于快速获取油菜单片叶面积和叶鲜重,长宽幂函数模型受施肥水平、栽种方式、叶形、生长期等因素影响较小,适用于精确估计单株油菜叶面积和叶鲜重。 相似文献
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叶部性状是粒用高粱重要的农艺性状,对提高高粱光合效率及株型育种适应机械化收获有着重要意义。为进一步探究粒用高粱叶部性状的遗传机制及不同环境下性状间的相互作用,本试验以植株矮小且叶片上冲、叶夹角较小的粒用高粱品种‘美引20’和植株较高且叶片披散具有较大叶夹角的‘忻梁52’为亲本配置杂交组合,对叶片数、叶夹角、叶长、叶宽、叶面积进行田间数据统计分析及遗传分析。研究表明：叶片数与叶夹角、叶长与叶宽以及叶宽与叶面积在3个环境中均呈极显著正相关,其他性状在3个环境下的相关性存在差异;叶片数在2019年天津静海和2020年天津宁河的最适遗传模型均为Model A＿1;叶夹角在2019年天津静海和2019年天津宁河的最适遗传模型均为Model B＿1;叶长在2019年天津静海和2020年天津宁河的最适遗传模型均为Model B＿6;叶宽在2019年天津宁河和2020年天津宁河的最适遗传模型均为Model A＿4;叶面积在2019年天津静海和2019年天津宁河的最适遗传模型均为Model A＿1。3个环境下的群体叶部性状均为主多基因控制的数量遗传性状,主基因遗传率因环境的不同而改变。 相似文献
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水稻叶片伸长过程的模拟模型 总被引：7，自引：0，他引：7
水稻叶片生长过程的动态模拟, 对于实现水稻生长的数字化和可视化表达具有重要的理论意义和应用价值。本研究以4个不同株型的水稻品种为试验材料, 通过对水分试验、氮素试验条件下不同叶位叶片的叶长、叶宽特征进行连续观测, 综合分析了水稻叶片几何形态指标随生育进程和环境条件的变化规律, 进而构建了水稻叶片生长过程的动态模拟模型。模型采用Logistic方程描述了水稻主茎及分蘖叶片随生长度日(GDD)的动态伸长过程; 利用二次曲线描述了叶宽随GDD的动态变化过程; 分别用幂函数和一元二次方程描述了叶形(不同叶长处的叶宽)的动态变化过程; 另外, 以叶片氮素和水分因子分别描述了不同水氮水平对叶片形态建成过程的定量影响。同时利用独立的水稻田间试验资料对所建模型进行了测试和检验, 主茎和分蘖动态变化叶长、叶宽的均方根差(RMSE)分别为3.6 cm、3.96 cm以及3.15 cm、3.56 cm。表明本模型对水稻叶片的动态伸长过程具有较好的预测性和解释性。 相似文献
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为了了解叶形态变化的规律,为苗木培育提供理论依据,笔者通过测定黎蒴、火力楠、枫香3种幼苗叶片的长度、宽度、叶面积和叶干重的方法,对这3种幼苗叶长和叶宽的相关性、叶面积与干重的相关性、比叶重的季节变化进行研究。结果表明：叶长和叶宽呈极显著正相关,黎蒴和枫香的叶长与叶宽相关性随季节变化,而火力楠的规律性不强。新叶和老叶的面积与干重极显著相关。新叶的比叶重上半年变化较大,下半年变化平缓,一般2－4月出现最低值;上半年新叶的比叶重比老叶低,下半年两者相近。3种阔叶幼苗叶片的相似性和比叶重随季节发生变化,幼苗叶片干物质的积累随叶面积的扩大而增加,叶片干重与叶面积的相关性与树种和叶龄有关。 相似文献
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以红花大金元、自育烤烟种质GDH 88为父本,4个国内推广品种为母本,根据NCⅡ设计组配了7个杂交组合,调查F1的主要农艺性状及其在大田移栽后不同时期的动态变化规律,分析杂种优势。研究显示,F1的综合农艺性状具有良好表现。叶宽与叶长的增长速度较为均匀;株高的增长速度呈递增状态;叶数在移栽后第45~60天增长速度显著增加;叶面积发生最明显变化的时期在移栽后第30~45天。所以在移栽的第30~45天对叶长、叶宽、叶面积进行水肥调控,移栽的第45~60天可对株高和叶数进行水肥调控,从而获得更好的杂种优势;在叶长、叶宽、株高、叶数和叶面积的优势中,株高优势最强,在育种选择时,应多偏重叶片性状。 相似文献
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K. Kandiannan C. Kailasam K. K. Chandaragiri & N. Sankaran 《Journal of Agronomy and Crop Science》2002,188(2):138-140
Black pepper (Piper nigrum L.) is an important spice used in cooking and medicine. It is cultivated in more than 20 countries in Asia, Africa and Latin America. India is a major producer, consumer and exporter of black pepper. Leaf area (LA) is an indicator of crop growth and productivity. This study was undertaken to develop a method of estimating the individual LA of black pepper directly without the necessity for time‐consuming area measurements. Ten black pepper lines were used in the study. Ninety matured leaves were collected from each line and an allometric relationship was derived by logarithmic transformation between actual leaf area (ALA) measured using the electronic leaf area meter LI‐3000 A (LI‐COR, Inc., Lincoln, NB) and leaf length (LL). The correlation coefficient (r) between ALA and LL ranged between 0.8692 and 0.9644 and the standard error (S.E.) between 0.0822 and 0.1149. The allometric models for 10 lines were: Panniyur 1, LA=0.7114 (LL)1.8409; Panniyur 2, LA=0.3692 (LL)2.067; Panniyur 3, LA= 0.6148 (LL)1.8838; Panniyur 4, LA=0.8355 (LL)1.7694; Sreekara, LA=0.8984 (LL)1.6692; Subhakara, LA=0.8384 (LL)1.738; Panchami, LA=0.3691 (LL)2.0749; Pournami, LA=0.4487 (LL)1.9718; Kottanadan, LA=0.3474 (LL)2.0634; P‐24, LA=0.7579 (LL)1.654. These allometric models were used to calculate LA, which was then compared with the actual LA, and the correlation coefficient (r) between them was found to be > 0.99. These allometric models can be used to estimate the LA of individual leaves of black pepper. The approximate total LA of a vine can be obtained using following formula: total leaf area of black pepper vine (cm2) = number of laterals per vine × number of leaves per lateral × leaf area of individual leaf. 相似文献
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澳洲坚果叶面积测定方法比较 总被引：2，自引：0，他引：2
为确定不同品种澳洲坚果叶面积测定的最佳方法,找出系数回归法测量澳洲坚果叶面积的最佳参数,对3种叶面积测量方法进行比较,对不同叶片参数与叶面积间的关系进行回归分析。结果表明,同一品种经方格法、画纸称重法、图像处理法测定的叶面积均无显著性差异,3种方法测定结果的相关系数都在0.999以上,说明3种方法均可作为澳洲坚果叶面积测定的可靠方法;不同品种的各叶片参数与叶面积间的回归系数并不相同,在利用系数回归法测量澳洲坚果叶面积时,叶长宽积是最能反映实际叶面积的叶片参数。本研究可为澳洲坚果的生理研究和生产实践提供重要参考。 相似文献
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A. Agueguia 《Journal of Agronomy and Crop Science》1993,171(2):138-141
Leaf area of cocoyam ( Xanthosoma sagittifolium ) can be estimated quickly and accurately using the mathematical relationship between linear measurements of leaves which relate leaf area (Y) to the product of length (L) and breadth (B).The most accurate relationship is Y = K (LB) with K = 0.923 + 0.004. 相似文献
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利用电子扫描镜观察了番茄、青椒、茄子的胚珠发育过程。观察结果显示，珠心原基从胎座部分化后，周围组织慢慢将珠心原基包被，继续分化完全包被后即成珠被。珠被进一步发育后即成倒生胚珠。在发育后期番茄的胚珠呈扁圆形，青椒的胚珠为近卵形，而茄子的胚珠为椭圆形。茄子和青椒的胚珠发育始期纵向生长较快，茄子从开花期、青椒从开花后期横向生长比例加大。番茄和茄子的胚珠纵横径的比例大致相同，青椒随着果型的加大胚珠大小随之增加 相似文献
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Christian Ugwu Agbo 《Journal of Crop Science and Biotechnology》2010,13(3):169-175
Utazi (Gongronema latifolia Benth.) clones obtained from some localities of Southeastern Nigeria were used to establish a research field in a randomized
complete block design with three replications. The extent of genetic diversity and selections on the vegetative traits were
determined. Results obtained showed diverse genetic base of the clones in the vegetative traits. Higher genetic variability
was observed in leaf area/plant, length of the longest vine/plant and number of leaves/plant in the clones. However, significant
environmental effect on length of the longest vine/plant and number of vines/plant resulted in lower broad sense heritability
estimate value for the traits. The broad sense heritability estimate for size of the cordate base, leaf area, breadth, and
length are high ranging from 74–86 %. The year had no significant effect on the traits with high broad sense heritability.
Strong positive correlation was observed between length of breadth and leaf area (r = 0.97; n = 46). The principal component
analysis indicated that the vegetative traits of the species could be classified based on the leaf area determined by leaf
length, breadth and size of the cordate base as well as the quantity of leaves on a clone. The GGE biplot analysis revealed
the pattern clones were distinctly positioned; clone EBS-15-NKALAGU had the highest level of all the attributes measured,
while EBS-16-ABAKALIKI had the least. Hence, clones EBS-15-NKALAGU, ENS-08-MBU and ENS-12-0KUTU could be selected for improvement
and production purposes because they rated high in the vegetative traits with high genetic effects in their expression over
the two years. 相似文献
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为了解不同调节剂对酸性草炭pH值调节作用,同时对草炭养分有效性的影响,评价调节后草炭的育苗特性,以碳酸钾、氧化钙为调节剂,设计不同的添加水平,分析不同投入量条件下草炭pH值、养分有效性变化规律及投入量与有效养分相关性,比较调节后草炭对番茄、辣椒幼苗生长的影响。结果表明,草炭pH值、速效磷、速效钾随着碳酸钾投入量增加而不断增加,草炭交换性钙、镁、锰和有效铁随着碳酸钾投入量的增加而不断减少;草炭pH值、交换性钙随着氧化钙投入量增加而不断增加,草炭交换性镁随着氧化钙投入增加先增加后减少,草炭交换性锰和有效铁随着氧化钙投入急剧减少。草炭添加不同水平的碳酸钾和氧化钙后,对番茄、辣椒幼苗生长发育皆表现为先改善后抑制的影响规律;同等条件下,碳酸钾对番茄、辣椒幼苗生长的改善效果强于氧化钙;每千克草炭添加碳酸钾2、4、6 g和氧化钙0.8、1.6 g改善效果显著,其对应的草炭pH 5.05、5.93、6.28、5.29、6.08;利用pH值与CI指标建立了碳酸钾-番茄模型、氧化钙-番茄模型、碳酸钾-辣椒模型和氧化钙-辣椒模型,其对应的最优pH 5.64、5.84、5.61、5.76。 相似文献
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[Object] To setup the hyperspectral sensing models for estimating SPAD value of cotton leaves under waterlogging stress. [Method] Irrigation and drainage controllable plots were introduced to simulate the waterlogging stress treatment in the flowering and boll forming stage, during which the change characteristics of the cotton leaf spectral reflectance and SPAD value were observed after 1 d, 3 d, 6 d, 9 d waterlogging, respectively. To find out the hyperspectral sensing models for estimating SPAD value of cotton leaves under waterlogging stress, the correlation and regression relationships between SPAD value and spectrum parameters were analyzed. [Result] (1) The SPAD value of the fourth cotton leaf from the top was significantly lower than control when suffers from waterlogging for 3 d, when waterlogged 9 d the SPAD value decreased by around 15% compared with the control. (2) The cotton suffering from waterlogged damage in the flowering and boll forming stage caused the reflection peak in green light wave band became steep, while the near infrared spectral reflectance increased, and caused the reduction of red absorption and red edge position "blue shifts", the red edge position drifts towards short wave with 4～5 nm when suffers from waterlogging for 9 d. With increase of the waterlogged days, the red edge slope and red edge area increased with a maximum value at 6 d of waterlogging, meanwhile, the skewness and kurtosis of red edge increased. (3) After waterlogging, the SPAD value of the fourth cotton leaf from the top (chlorophyll content) had a remarkable correlation with red edge slope(Dr), red edge position(λr), green peak reflection(Rg), green peak position(λg), red well position(λo), blue edge area(SDb), yellow edge skewness(Sy), yellow edge kurtosis(Ky), red edge skewness(Sr), red edge kurtosis(Kr), etc. An experience linear, polynomial and exponential models for estimating SPAD value had been built through using the Sy, Sr, Kr as independent variables, respectively, their determination coefficient (R2) were greater than 0.9, and the root mean square error (RMSE) were less than 1; and an experience binary linear regression equation for estimating SPAD value had been built through multivariate regression using the λg, SDr/SDb(VI3), Sb, Sy, Ky as independent variables, the R2 was as high as 0.973, and the RMSE was 0.393. [Conclusion] The model can be remote sensing model used as estimating leaf SPAD of cotton value under waterlogging stress. 相似文献
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通过对168份玉米杂交组合的穗三叶长、宽、面积与产量的相关性分析,探究各性状与玉米产量的相关性,为优良玉米品种的选育提供理论基础。结果表明,小区产量的变异系数较大,达到19.27%,穗三叶各性状的变异系数范围为6.34%~9.59%,变异程度相似。相关分析表明,小区产量与穗三叶各性状为正相关关系。通径分析中各性状对玉米产量的正向直接通径系数大小依次为穗上叶宽、穗上叶长、穗位叶面积、穗位叶长、穗下叶面积、穗下叶宽、穗下叶长、穗位叶宽、穗上叶面积,负向直接通径系数大小依次为穗下叶长、穗位叶宽、穗上叶面积。因此,增加穗三叶叶面积可以有效提高玉米产量,尤其是通过增加穗下叶宽和穗位叶长提高叶面积的玉米杂交种,更有利于产量的增加。 相似文献