Effects of Consecutive Low Temperature on Stomatal Conductance of Rice with Different Maturity Periods at Booting and Blooming Stages in Shenyang Region

doi:10.3969/j.issn.1000-6362.2016.06.008

Abstract

Abstract: The experiment was conducted in climate chamber to explore the effects of different intensities of low temperature on stomatal conductance of rice with different maturity at booting and blooming stages in Shenyang region. 9023, 9035, 9036 were chosen as representative early, middle and late maturity varieties, respectively. Two temperature treatments were stetted for 5 days, which were 3℃(D3) and 5℃(D5) lower than outside temperature of the last day, CO2 and light response curves of second leaf from top were measured for treatment and control plants (grown under natural conditions as control, mark CK) by using LI-6400 photosynthesis analyzer. The results showed that:(1) during CO2 response, the leaf stomatal conductance of D3 and D5 treatment plants showed a significant decrease compared with that of CK plants for 9035(middle) and 9036(late) maturity varieties, while decrease for 9023(early) maturity variety only in D5 treatment. (2) During light response, the leaf stomatal conductance of treatment plants showed the similar variation with the results of (1) compared with that of CK plants for 9035(middle) and 9036(late) varieties, but increase for 9023(early) maturity variety in D3 and D5 treatment(P<0.01). (3) Stomatal limitation mechanism is the main mechanism that leads to decrease of photosynthetic induced by low temperature for 9035(middle) variety, whereas, the decline in photosynthetic rate is mainly due to non-stomatal limitation for 9023(early) and 9036(late) maturity varieties. 9035(middle) and 9036(late) varieties are more sensitive than 9023(early) maturity variety to low temperature.

Key words: Booting and blooming stage, Consecutive low temperature, Stomatal conductance, Stomatal limitation

MA Xi-da, REN Chuan-you, WANG Yan-hua, XU Yi-dan, ZHAO Dong-ni, CHEN Wei, YANG Bin, TIAN Ping. Effects of Consecutive Low Temperature on Stomatal Conductance of Rice with Different Maturity Periods at Booting and Blooming Stages in Shenyang Region[J]. Chinese Journal of Agrometeorology, 2016, 37(06): 682-690.

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