Citrus Seedling Growth and Susceptibility to Root Rot as Affected by Phosphite and Phosphate     

Vladimir Orbović  James P. Syvertsen  Diane Bright  Deborah L. Van Clief  James H. Graham 《Journal of plant nutrition》2013,36(4):774-787

The growth of ‘Ridge Pineapple’ sweet orange [Citrus sinensis (L.) Osbeck] seedlings and their susceptibility to Phytophthora root rot were studied under contrasting supplies of phosphate (Pi) or Phosphite (Phi). After 10 weeks of repeated applications of nutrient solutions, Phi concentrations were barely detectable in soil. Soil Pi was higher in Phi treatments than in pots that received Pi alone. Seedling growth was greatest when supplied with Pi or Phi separately, but when Pi and Phi were combined, growth was reduced to levels comparable to plants that received no P. Phi was found in both stems and leaves after it was applied to soil supporting the mobility of Phi within the plant. In addition, a small amount of Phi was found in roots after applications of Phi in foliar sprays. Different sources of soil-applied P did not affect the amount of Pi in roots, while the amounts of Pi in leaves were higher in plants that received Phi and Pi combined. Root resistance to Phytophthora root rot of citrus seedlings treated with Phi alone or in combination with Pi was greater than in plants treated with Pi alone, confirming the antifungal effect of Phi.  相似文献   

Progress of discoloration in green,freshly cut veneer sheets of black alder (Alnus glutinosa L.) wood     

《Wood material science & engineering》2013,8(2):178-184

Abstract

Black alder wood has a great potential for more wide-spread use in the woodworking industry. This study describes the colour changes that appeared the first few hours after cutting thin veneer sheets from fresh, unseasoned black alder wood. CIELab coordinates were recorded for 50 spots at time intervals from 0 to 140 minutes exposure of the fresh-cut surfaces. The most pronounced change was increased lightness developing from 20 to 60 minutes after cutting. A model for total colour change as function of exposure time was developed. Redness of veneer sheets increased only slightly, i.e. the expected transfer to orange discoloration of the surface did not occur. The reason for this was probably that part of the free water in the wood was squeezed out during veneer production. The findings of this study give useful information about the colour change that appeared directly after veneer cutting, advising to avoid excess water on wood surface and ensuring quick surface drying.  相似文献   

脐橙CsACBPs基因家族在果皮褐变过程中的表达分析     

杨阳  唐宁  李正国 《热带作物学报》2013,34(6):1103-1109

脐橙(Citrus sinensis Osbeck)果皮褐变,不仅影响果实外观,更降低口感风味,削弱商品价值.酰基辅酶A结合蛋白(ACBP)是乙酰辅酶A(Acetyl-CoA)的跨膜转运载体,帮助乙酰辅酶A在体内完成三羧酸循环,对植物的生长发育起到关键作用.已有文献报道ACBP家族中的基因对植物胁迫有应答,并且在脐橙果皮褐变相关基因的cDNA抑制差减文库中该基因也有明显变化.为了明确柑橘果实褐变过程中该基因的作用,以“奉园72-1”脐橙果实为材料,取不同程度褐变的果皮,并从脐橙果皮褐变相关基因的cDNA抑制差减文库中筛选了与酰基辅酶A结合蛋白(ACBP)基因家族同源的EST序列CsA CBP1/4/5/6进行分析.结果表明:随着柑橘果皮褐变程度的加重,CsA CBP1/4/5/6基因表达上调,说明CsA CBPs基因与脐橙果实褐变密切相关.  相似文献   

不同种植方式下的脐橙经济林水土保持效果分析     

张维玲  张孝金  陈万钧  梁跃龙 《湖北农业科学》2013,52(3)

在经济林产业发展的背景下,水土流失成为严重生态问题.研究提出在脐橙经济林内套作大豆、套作百喜草、间作梨树3种种植方式,并在不同坡位进行3种种植方式下的土壤含水量、土壤容重、雨季水土流失量的测定.结果表明,套作大豆具有较好的保水效果,套作百喜草次之,上坡位间作梨树也有一定效果.套作大豆或百喜草有利于表层土壤容重的降低,然而该种植方式对中、下层土壤改良效果不明显;间作对土壤容重上、中、下各层次均有改良.水土流失主要集中在中、上两个坡位,研究发现套作大豆和百喜草均可显著降低中坡和上坡的水土流失量.  相似文献   

全橙果渣面包工艺优化及受欢迎度评价     

王健  高敬严  胡强  刘晓伟 《保鲜与加工》2021,21(4):73-79

橙子切块加水打浆后,将橙子渣添加到高筋小麦粉中制得全橙果渣面包,在单因素试验的基础上进行响应面分析优化全橙果渣面包工艺。结果表明,全橙果渣面包的最佳工艺为:高筋小麦粉500 g,全橙果渣140 g,牛奶200 g,白砂糖72 g,酵母10 g,食盐7 g,黄油31 g,焙烤温度为上火210℃、下火180℃,焙烤时间12 min,得到具有鲜橙特殊色泽、香气、滋味的营养面包。此工艺条件下烘烤出的全橙果渣面包纤维素含量增加了60%,经过模糊数学计算,受欢迎度值80.68,为非常喜欢。  相似文献   

酸解醇沉法提取柑橘皮果胶工艺的优化     

戴余军  石会军 《北方园艺》2012,(1):54-57

以干燥的柑橘皮为试材,采用酸解醇沉法提取果胶,通过单因素实验及正交实验研究料液比、pH值、浸提温度、浸提时间以及乙醇浓度对柑橘皮果胶提取率的影响。结果表明:料液比是影响柑橘皮果胶提取率的最主要因素;提取果胶的最优工艺条件为:浸提温度85℃、料液比1∶8、pH 2.0、浸提时间45min、乙醇浓度为90%,在此条件下,柑橘皮果胶的提取率达到14.86%。  相似文献   

纽荷尔和清家脐橙果实大量矿质营养元素含量与累积变化   总被引：2，自引：0，他引：2  

解发  彭良志  淳长品  江才伦  曹立  凌丽俐 《中国南方果树》2012,41(1):7-10

在重庆北碚,以30年生枳砧清家脐橙和纽荷尔脐橙为材料,分析果实生长发育过程中N、P、K、Ca、Mg和S等6种大量营养元素含量和累积量变化。结果表明,果实生长发育过程中,纽荷尔和清家果实中N、P、Mg和S含量4月最高,Ca在10月最高,纽荷尔和清家K含量分别在9月和7月最高;Ca的主要累积时期,纽荷尔脐橙果实为6—7月和9—10月,清家脐橙果实为6月、8月和10月;除Ca外的其他大量矿质营养元素累积量较大的时期,纽荷尔和清家脐橙果实的总体上均为6—9月和11月,但清家脐橙累积最高峰一致出现在6月,纽荷尔脐橙累积最高峰至少推迟1个月左右。  相似文献   

辐照对海南绿橙贮藏保鲜品质影响     

康效宁  吉建邦  何艾 《农产品加工．学刊》2012,(11):110-111,138

研究了不同辐照剂量对海南绿橙贮藏期感官指标、还原糖、总酸和总抗坏血酸等营养成分含量的影响。结果表明,辐照处理对海南绿橙果实总抗坏血酸、对还原糖含量影响较小,对总酸含量影响较大,辐照剂量小于3 kGy对其感官指标基本上无影响。  相似文献   

甘南州道地藏药植物资源区域分布与保护对策初探   总被引：1，自引：0，他引：1  

何淑玲  马令法  常毓巍  付玉红 《广东农业科学》2012,39(6):45-47

通过实地调查、标本采集和有关文献查阅,对甘南州道地藏药植物资源的种类及区域分布进行研究和归纳整理。结果表明:甘南州道地藏药植物种类有88科299属625种,主要分布在甘南州的中东部、中北部、东南部、西部4个区,研究还发现已有部分珍稀植物已濒临灭绝,因此提出了保护和永续利用该地区道地藏药植物资源的对策和建议,为甘南州道地藏药植物资源的合理开发和充分利用提供科学依据。  相似文献   

杀螨剂四螨嗪在柑橘园中的残留降解     

张素芳  龚道新  伍一红  谢惠  周圣超 《湖南农业科学》2012,(1):77-79,82

为了全面系统地了解四螨嗪及其制剂在柑橘园使用后四螨嗪的残留降解情况,于2009～2010年在湖南、浙江和贵州三地通过田间试验,借助HPLC分析技术,研究了四螨嗪在柑橘园的降解动态。结果表明:四螨嗪在柑橘全果和土壤中的降解速度基本相同;四螨嗪在柑橘园土壤中的降解半衰期在7.13 d～8.73 d之间,平均值为7.79 d。四螨嗪在柑橘全果中的降解半衰期在5.74 d～7.83 d之间,平均值为6.95 d。按照《化学农药环境安全评价实验准则》中划分的标准,可知四螨嗪为低残留、易降解的农药,在柑橘园中使用是安全的。  相似文献