Effects of chilling and high temperatures on photosynthesis and chlorophyll fluorescence in leaves of watermelon seedlings
文献类型： 外文期刊
作者： Hou, W. 1 ; Sun, A. H. 3 ; Chen, H. L. 4 ; Yang, F. S. 1 ; Pan, J. L. 2 ; Guan, M. Y. 2 ;
作者机构： 1.Hainan Univ, Coll Agron, Haikou 570228, Peoples R China
2.Haikou Meteorol Bur, Haikou Meteorol Stn, Haikou 571100, Peoples R China
3.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou 571737, Peoples R China
4.Inst Meteorol Sci, Haikou 570203, Peoples R China
关键词： chlorophyll content;Citrullus lanatus;irradiance;stomatal conductance;transpiration rate
期刊名称：BIOLOGIA PLANTARUM （ 影响因子：1.747； 五年影响因子：2.146 ）
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收录情况： SCI
摘要： The effects of chilling (CT, day/night temperatures of 12/10 A degrees C, an irradiance of 250 mu mol m(-2) s(-1)), chilling combined with a low irradiance (CL, 12/10 A degrees C, 80 mu mol m(-2) s(-1)), and a high temperature (HT, 42/40 A degrees C, 250 mu mol m(-2) s(-1)) on chlorophyll content, chlorophyll fluorescence, and gas exchange were studied in two watermelon cultivars, ZJ8424 and YS01, differing in their resistance. The chlorophyll content, net photosynthetic rate (P-N), stomatal conductance (g(s)), and transpiration rate (E) decreased substantially, whereas the intercellular CO2 concentration (c(i)) increased when the two watermelon cultivars were grown under these stresses. The photosynthetic parameters showed greater changes at chilling than at the high temperature, and the CL caused a more pronounced inhibition in PN compared with the CT. After 2 d exposure to the CT, YS01 had higher P-N, g(s), and E, but a lower ci compared with ZJ8424. The maximum efficiency of photosystem (PS) II photochemistry (F-v/F-m), effective quantum yield of PS II photochemistry (I broken vertical bar(PSII)), photochemical quenching (qP), and electron transport rate (ETR) decreased under the CT and CL but showed only a slight drop under the HT. All these stresses significantly increased non-photochemical quenching (NPQ). The CT brought more damage to the photosynthetic apparatus of leaves compared with the CL. In addition, after returning to normal conditions (25/15 A degrees C, 250 mu mol m(-2) s(-1)) for 3 d, the photosynthetic parameters recovered to pre-stress levels in HT treated seedlings but not in CT treated seedlings. In conclusion, the low irradiance could help to alleviate the extent of photoinhibition of PS II photochemistry caused by chilling and cv. ZJ8424 was more sensitive to the extreme temperatures than cv. YS01.
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