title: Contributions of nonleaf organs to the yield of cotton grown with different water supply.
abstract: The objectives of this experiment were (i) to determine the effect of water supply on the photosynthetic capacity of leaves, bracts, capsule walls, and stalks of cotton at different growth stages and (ii) to determine the contributions of these nonleaf organs to whole plant photosynthesis. Water deficit reduced the total surface area per plant but increased the proportion of nonleaf to total plant surface area. Net photosynthetic rates of leaves declined rapidly beginning 25 days after anthesis. In contrast, the net photosynthetic rates of bracts and capsule walls were insensitive to soil moisture stress and decreased by a small amount between 25 and 45 days after anthesis. The relative contribution of bracts and stalks to canopy apparent photosynthesis (CAP) increased under water deficit conditions. Cotton seed weight in the conventional irrigation treatment decreased by 10.1-29.7% when the bolls (capsule walls plus bracts) were darkened and by 5.3-9.9% when the stalks were darkened. On a percentage basis, both boll photosynthesis and stalk photosynthesis contributed more to seed weight when the plants were grown under water deficit conditions rather than nondeficit conditions. In conclusion, nonleaf organs contribute significantly to yield when cotton plants are under water stress during late growth stages.
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Dongxia
authors: D
authors: Zhan
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Ying
authors: Y
authors: Yang
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Yuanyuan
authors: Y
authors: Hu
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Yali
authors: Y
authors: Zhang
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Honghai
authors: H
authors: Luo
authors: The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, China.
authors: Wangfeng
authors: W
authors: Zhang
mesh_terms: D003368:Gossypium / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology*; D010788:Photosynthesis; D012987:Soil / Q000737:chemistry; D014867:Water
chemical_list: D012987:Soil; D014867:Water