摘要
以沙糖桔为材料,在果实膨大期通过去果处理降低库力,同时设留果作对照,环剥1年生春梢结果枝和保留相同数量叶片严格控制光合产物的交流,并对源叶净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)等叶片光合特性进行比较研究,探讨去果调节库-源关系后对沙糖桔叶片光合特性的影响。结果表明:去果减库显著降低沙糖桔叶片的Pn、Gs和Tr,而对饱间CO2浓度(Ci)、气孔限制值(Ls)和水分利用率(WUE)影响不大;库-源关系的改变不影响沙糖桔叶片Pn的日变化曲线,仍然表现为典型的"双峰"曲线,首峰、次峰分别在上午8:00及下午14:00时出现,且均无明显光合"午休"现象。
In order to study the effects of altered source-sink correlation on leaf photosynthetic characteristics at fruit fast development stages in Shatangju tangerine, fruit thinning and retaining fruit were carried out on one-year-old shoot, and through preventing exportation of the assimilates to the non experimental parts of the tree by girdling one-year-old shoot and keeping the sane leaves between fruit thinning and retaining fruit, and the photosynthetic characteristic was analyzed. The results showed that: Fruit thinning significantly decreased net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate(Tr), while no significant different of substomatal CO2 (Ci) ,Ls and WUE. The alter of source-sink correlation did not impact the curve of the diurnal change in the Pn , they were all showed a typical bimodal curve, the first and the second peak occurredat 8:00 and 14:00 respectively, and no "midday depression phenomenon of photosynthesis" occurred .
出处
《广东农业科学》
CAS
CSCD
北大核心
2009年第8期93-95,共3页
Guangdong Agricultural Sciences
基金
广东省农科院重点支撑项目(2007-支撑-26)
关键词
沙糖桔
库-源关系
光合特性
净光合速率
Shatangju tangerine
source-sink correlation
photosynthetic characteristic
net photosynthetic rate