title: Rapid recovery of photosynthetic rate following soil water deficit and re-watering in cotton plants (Gossypium herbaceum L.) is related to the stability of the photosystems.
abstract: The responses of gas exchange, chlorophyll fluorescence and the anti-oxidative system of cotton leaves were studied during water deficit and recovery. The results show that water deficit led to a reversible reduction in the photosynthetic rate. This reduction was mainly accompanied by stomatal limitation. The activity of photosystem II (PSII) and photosystem I (PSI) was relatively stable during water deficit and recovery. Water deficit caused an enhanced production of reactive oxygen species (ROS) and increased lipid peroxidation. Proline accumulation and the anti-oxidative enzymes such as superoxide dismutase (SOD), ascorbate peroxidase (APX) and peroxidase (POD), along with the antioxidant ascorbate (AsA), increased during water deficit. On re-watering, the ROS generation rate, anti-oxidative enzymes activities and the extent of the lipid peroxidation returned to near control values. Overall, rapid recovery of the photosynthetic rate is related to the stability of the photosystems which appears to be a critical mechanism allowing cotton plants to withstand and survive drought environments.
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China.
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Yi
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China.
authors.forename: Ya-Li
authors.initials: YL
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China.
authors.forename: He-Sheng
authors.initials: HS
authors.lastname: Yao
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China.
authors.forename: Hong-Hai
authors.initials: HH
authors.lastname: Luo
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China.
authors.forename: Ling
authors.initials: L
authors.lastname: Gou
authors.affiliation: Division of Plant Sciences, Research School of Biology, College of Medicine, Biology and Environment, The Australian National University, ACTON ACT 2601, Australia.
authors.forename: Wah Soon
authors.initials: WS
authors.lastname: Chow
authors.affiliation: The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, PR China. Electronic address: zhwf_agr@shzu.edu.cn.
authors.forename: Wang-Feng
authors.initials: WF
authors.lastname: Zhang
mesh_terms: D000222:Adaptation, Physiological; D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D055864:Droughts; D003368:Gossypium / Q000201:enzymology / Q000502:physiology; D015227:Lipid Peroxidation; D009195:Peroxidase / Q000378:metabolism; D010788:Photosynthesis / Q000502:physiology; D045331:Photosystem I Protein Complex / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D018515:Plant Leaves / Q000201:enzymology / Q000502:physiology; D017382:Reactive Oxygen Species / Q000378:metabolism; D012987:Soil; D013312:Stress, Physiological; D013482:Superoxide Dismutase / Q000378:metabolism; D014867:Water / Q000502:physiology*
chemical_list: D000975:Antioxidants; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D017382:Reactive Oxygen Species; D012987:Soil; D014867:Water; D002734:Chlorophyll; D060387:Ascorbate Peroxidases; D009195:Peroxidase; D013482:Superoxide Dismutase
keywords: Cotton; Photosynthesis; ROS metabolism; Re-watering; Water deficit