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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (01): 100-108.doi: 10.3734/SP.J.1006.2015.00100

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Drip Irrigation on Photosynthetic Characteristics of Leaves and Bracts in Cotton at Late Growth Stage

ZHANG Chao,ZHAN Dong-Xia,ZHANG Ya-Li,LUO Hong-Hai,GOU Ling,ZHANG Wang-Feng*   

  1. Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group / Agricultural College, Shihezi University, Shihezi 832003, China
  • Received:2014-05-27 Revised:2014-09-30 Online:2015-01-12 Published:2014-11-11
  • Contact: 张旺锋, E-mail: zhwf_agr@shzu.edu.cn. zwf_shzu@163.com, Tel: 0993-2057326 E-mail:dhtzcwlp2004@126.com

Abstract:

Themajority of cotton (Gossypium hirsutum L.) photosynthetic products comes from leaves, but non-foliar green organs of cotton such as bracts also contain chlorophyll and may contribute to the yield. We selected Xinluzao 33 and Xinluzao 46 with two irrigation treatments (normal drip irrigation and water-saving drip irrigation) to determine physiological indices including response curves of net photosynthetic rate (Pn), photosynthetically active radiation (PAR), intercellular CO2 concentration (Ci), fluorescence parameters, and water content of cotton bracts and leaves and to explore the difference of photosynthetic capacity between bracts and leaves under drip irrigation conditions. The results showed that bracts showed greater RuBP regeneration/RuBP carboxylation capacity ratio (Jmax/Vc,max) and lower stomatal conductance under high irradiance and temperature conditions. Photosynthetic area per plant, chlorophyll content, water content, Pn, the actual photochemical efficiency of PSII (ΦPSII), and Rubisco content were less in bracts than in leaves, but the decline of the indices showed a significantly faster in leaves than in bracts at the late growth stage. Compared with normal drip irrigation, the decreased degree of water content under water-saving drip irrigation was significantly higher in leaves than in bracts of cotton plants, and chlorophyll content, Pn, and Rubisco content decreased in leaves under water-saving drip irrigation, but there was no significant changed in bracts. The stabilities of bracts area, water content, chlorophyll content, Pn, ΦPSII, rubisco content in bracts were higher than those in leaves. It indicated the photosynthetic activity of leaves decreased rapidly. The bracts contributed approximate 7.22%–8.83% of the total photosynthate at the late growth stage under normal drip irrigation, and 10.24%–12.53% under water-saving drip irrigation. We concluded that bracts can increase the photosynthate of plant at the late growth stage under water-saving drip irrigation.

Key words: Bract, Cotton, Water-saving drip irrigation, Photosynthetic activity

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