Xingjiang Tianye Group Co.
Xingjiang Tianye Group Co.
Wang Z.-J.,Xinjiang Academy of Agricultural and Reclamation Science |
Ye C.-X.,Xinjiang Academy of Agricultural and Reclamation Science |
Dong Y.-M.,Xinjiang Academy of Agricultural and Reclamation Science |
Li Y.-Z.,Xinjiang Academy of Agricultural and Reclamation Science |
And 5 more authors.
Zhiwu Shengli Xuebao/Plant Physiology Journal | Year: 2016
In order to illustrate the possible differences in photosynthetic physiology, chlorophyll fluorescence parameters and yield components of rice (Oryza sativa subsp. keng) in response to drip irrigation under mulch film and continuous flooding, photosynthetic pigment contents, light-CO2 response curves, chlorophyll fluorescence parameters, activities of protective enzymes, osmolyte contents of flag leaves at full panicle stage and yield components of four rice lines named T-04, T-43, T-66 and T-69 were collected and analyzed, respectively. The results obtained are as follows: (1) photosynthetic pigment contents of all four accessions under drip irrigation with plastic film mulching were lower than that under flooding irrigation, but were not significantly difference at 5% level. (2) As for the following photosynthetic parameters such as net photosynthetic rate (Pn), stomatal conductance (Gs), the maximum net photosynthetic rate under saturation light or saturation CO2 (Pn,max), the light saturation point (LSP), and carboxylation efficiency (CE) of rice under drip irrigation were all significantly lower than that under flooding one, but most of the following parameters such as intercellular CO2 concentration (Ci), light compensation point (LCP), CO2 compensation point (CCP), photorespiratory rate (Rp), apparent quantum efficiency (AQY), and respiration rate (Rd) were significantly higher than that under flooding one. (3) Considering chlorophyll fluorescence parameters such as the effective quantum yield of photosystem II (ΦPSII), photochemical quenching (qP), and the maximal quantum yield of photosystem II (Fv/Fm) were higher than that under flooding one, but electron transport rate (ETR), minimal fluorescence (Fo), and maximal fluorescence (Fm) were lower than that of flooding one. There was little difference between non-photochemical quenching (NPQ). (4) Both the contents of soluble protein (SP) and soluble sugar (SS) were lower than that under flooding one, but the content of malondialdehyde (MDA) was higher than that under flooding. Activity of superoxide dismutase (SOD) was higher than that under flooding, but for activities of catalase (CAT) and peroxidase (POD), there were little differences between the two cultivation methods. (5) Plant height, tiller number, grain numbers per spike, spike length, grain per spike, 1000-grain weight, effective panicle number and seed production of rice under drip irrigation were all lower than that under flooding, but there were little differences in seed setting rate and secondary branch number. Considering most of photosynthetic parameters of flag leaves at full panicle stage and production components of rice in responsive to drip irrigation under film were significantly lower than that under flooding one, it implies that rice plants under drip irrigation suffered water stress to some degree, which also was the key limit factor for seed production improving. © 2016, Science Press. All right reserved.