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EFFECTS OF WATER DEFICIT ON PHOTOCHEMICAL ACTIVITY AND EXCITATION ENERGY DISSIPATION OF PHOTOSYNTHETIC APPARATUS IN COTTON LEAVES DURING FLOWERING AND BOLL-SETTING STAGES
Received date: 2007-06-05
Accepted date: 2007-08-23
Online published: 2008-05-30
Aims Cotton (Gossypium hirsutum) is a major crop in Xinjiang Province, Northwest China. Because Xinjiang is characterized by deficiency of water resource and strong irradiance, study of water deficit on photoinhibition of cotton in this area is crucial not only for efficient irrigation, but also for physiological exploration of plant photo-protection strategy.
Methods We investigated the effects of water deficit on physiological characteristics of cotton in the field. We measured diurnal variations of photon flux density (PFD), leaf temperature (Tleaf), pre-dawn maximal photochemical efficiency of PSⅡ (Fv/Fm), PSⅡ photochemical efficiency (ΦPSⅡ), electron transport rate (ETR), photochemical quenching (qp) and non-photochemical quenching (NPQ), as well as chlorophyll content and water potential of cotton leaves subjected to different water supplies.
Important findings Compared to control (70%-75% of field capacity), the diurnal variation of leaf incident PFD was similar and Tleaf was higher with mild water deficit (55%-60% of field capacity). The diurnal variation of leaf incident PFD with moderate water deficit (40%-45% of field capacity) was similar before 12∶00 and then lower, as a result of leaf wilting than in the control. Leaf temperature with moderate water deficit was significantly higher than in the control during daytime. No significant effects were observed on pre-dawnFv/Fm; all values were between 0.83 and 0.84. There were no differences in diurnal variations of ΦPSⅡ, ETR and qp between mild water deficit and control. However, NPQ with mild water deficit was similar before noon and then lower than the control. At 12∶00,ΦPSⅡ, ETR and qp with moderate water deficit were significantly decreased and then recovered gradually to control values, possibly due to the decreased leaf incident PFD resulting from temporary and passive leaf wilting. However, NPQ with moderate water deficit was higher before 12∶00 and similar at 14∶00 but after that was lower than control. Water potential and chlorophyll content decreased with water deficits, but the Chl a/b ratio increased. All results showed that cotton leaves could acclimate to water deficit through changing leaf orientation and chlorophyll content to regulate light energy captured by leaves and changing electron transport rate and thermal dissipation ratio. We suggest that the risk of photosynthetic apparatus damage by excessive excitation energy could be decreased greatly through passive movement of cotton leaf wilting with moderate water deficit.
Key words： photosynthesis; excitation energy dissipation; water deficit; leaf movement; cotton
ZHANG Ya-Li, LUO Hong-Hai, ZHANG Wang-Feng, FAN Da-Yong, HE Za-Ju, BAI Hui-Dong . EFFECTS OF WATER DEFICIT ON PHOTOCHEMICAL ACTIVITY AND EXCITATION ENERGY DISSIPATION OF PHOTOSYNTHETIC APPARATUS IN COTTON LEAVES DURING FLOWERING AND BOLL-SETTING STAGES[J]. Chinese Journal of Plant Ecology, 2008 , 32(3) : 681 -689 . DOI: 10.3773/j.issn.1005-264x.2008.03.018
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