作物学报Issue(12)：1880-1887,8.DOI:10.3724/SP.J.1006.2015.01880
膜下滴灌水分亏缺下棉花开花后非叶绿色器官光合特性及其对产量的贡献
Photosynthetic Characteristics after Flowering and Contribution of Non-leaf Green Organs of Cotton to Yield under Mulching-drip Irrigation with Water Deficiency
摘要
Abstract
Leaf is one of the main photosynthetic organs, while other green parts of plant also retain or develop chlorophyll and have photosynthesis. To better understand the whole plant photosynthesis production potential and contribution to cotton yield, we selected Xinluzao 33 and Xinluzao 45 (two common cultivars in Northern Xinjiang) with three irrigation treatments (CI, conven-tional irrigation; SDI, slight deficit irrigation; MDI, moderate deficit irrigation) to measure the chlorophyll content (Chl), net pho-tosynthetic rate (Pn), stomatal conductance (gs) and photosynthate accumulation in leaf and non-leaf green organs during different growth stages and the contribution of non-leaf green organs to yield. The results showed that the Pn and Chl in non-leaf organs were relatively insensitive to soil moisture stress, decreasing by only a small amount between 25 and 45 days after anthesis. With reduction of water supply, the dry matter production in non-leaf green organs played more important roles in cotton yield forma-tion. Cotton boll weight in the moderate deficit irrigation treatment decreased by 16.8% to 34.9% when the bolls (capsule walls plus bracts) were shaded and by 7.6% to 17.5% when the stalks were shaded. Hence, limiting-irrigation treatment is important to maintain high leaf photosynthetic rates. It is also important to develop the potential photosynthetic capacity of non-leaf green or-gans. This is especially important when leaf photosynthesis capacity declines due to leaf aging or water stress.关键词
棉花/非叶绿色器官/光合能力/相对贡献率/水分亏缺Key words
Cotton/Non-leaf green organ/Photosynthesis/Relative contribution/Water deficiency引用本文复制引用
占东霞,张超,张亚黎,罗宏海,勾玲,张旺锋..膜下滴灌水分亏缺下棉花开花后非叶绿色器官光合特性及其对产量的贡献[J].作物学报,2015,(12):1880-1887,8.基金项目
本研究由国家自然科学基金项目(U1203283)和新疆生产建设兵团博士基金项目(2013BB002)资助。This study was supported by the National Natural Science Foundation of China (U1203283) and the Doctoral Foundation Program of Xinjiang Production and Construction Corps (2013BB002) （U1203283）
