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为了阐明水稻光温敏不育系幼穗分化期耐冷的形态生理机制,以耐冷不育系Y58S和4个生产上常用光温敏不育系为试验材料,研究了低温胁迫(17.5℃,10 d)下结实率、穗部形态、株高、光合特性以及抗氧化物酶系统等的变化。结果表明,低温胁迫下Y58S的幼穗分化期耐冷性在5个不育系中最强,与敏感的C815S和株1S相比,Y58S表现为株高和穗长降低幅度较小,保持较高结实率;光合作用受低温影响不显著,SPAD值、光合速率等光合指标无显著变化;SOD、POD活性降低幅度较小,MDA含量、相对电导率增幅较小。
In order to elucidate the morphological and physiological mechanisms of photosynthetic temperature-sensitive male-sterile lines in cold-resistant stage of panicle differentiation, two cold-tolerant male sterile line Y58S and four thermo-sensitive photo-thermo-sensitive male sterile lines were used as experimental materials to study the effects of low temperature stress (17.5 ℃, 10 d) lower seed setting rate, panicle morphology, plant height, photosynthetic characteristics and changes of antioxidant enzyme system. The results showed that under cold stress, the cold tolerance of Y58S in spikelet differentiation was the strongest among the five CMS lines. Compared with the susceptible C815S and 1S lines, Y58S showed a lower decrease in plant height and spike length, Seed setting rate; photosynthesis was not affected by low temperature, but there was no significant change in photosynthetic indexes such as SPAD value and photosynthetic rate; the decrease of SOD and POD activity was little, but MDA content and relative conductivity increased less.