Chinese Journal OF Rice Science >
Photosynthetic Characteristics of Rice Under Drip Irrigation with Plastic Film Mulching and Continuous Flooding
Received date: 2014-04-10
Revised date: 2014-12-23
Online published: 2015-03-10
Photosynthetic pigments contents,photosynthetic characteristics,chlorophyll fluorescence parameters, osmolytes,and water use efficiency(WUE) and yield factors at milky stage of two rice lines T-04 and T-43(Oryza sativa subsp. keng) were analyzed under traditional continuous flooding and drip irrigation with plastic film mulching in a pot experiment. The results showed that the WUE of rice under drip irrigation with plastic film mulching were higher than that under traditional flooding, but chlorophyll a,chlorophyll b and carotenoids contents were significantly reduced compared with those under traditional continuous flooding.The maximum leaf net photosynthetic rate,relatively high intercellular CO2 concentration(Ci) and an equivalent stomatal conductance(GS),transpiration rate(Tr) were significantly lower than those under continuous flooding, indicating that the reduced photosynthetic rate was attributed to both chlorophyll contents and stoma.Apparent quantum efficiency(AQY), carboxylation efficiency(CE), ΦPSⅡ,electron transport rate (ETR) and Fv/Fm decreased significantly (P<0.05). Lower photosynthetic pigments contents might be the main factor to low leaf photosynthetic rate which directly leads to 1ower light-harvesting capacity and photochemical conversion efficiencies of the PSⅡ reaction center. The contents of soluble sugars(SS) and soluble proteins(SP) were lower, but both proline (Pro) and malondialdehyde(MDA) contents were higher than those under continuous flooding cultivation,implicating that drip irrigation with plastic film mulching resulted in membrane lipid peroxidation,and cell membrane damage to some degree, but activated osmolytes accumulation thus enhanced its drought tolerance. Effective panicle number per unit area and seed setting rate under drip irrigation with plastic film mulching were significantly reduced,leading to a declined seed production.
Zhi-jun WANG, Zong-ming XIE, You-sheng TIAN, Lin CHEN, Yong-mei DONG, You-zhong LI, Zhao-zhi LV . Photosynthetic Characteristics of Rice Under Drip Irrigation with Plastic Film Mulching and Continuous Flooding[J]. Chinese Journal OF Rice Science, 2015 , 29(2) : 150 -158 . DOI: 10.3969/j.issn.1001-7216.2015.02.006
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