白叶1号的低温抗逆特性分析

Analysis of the Cold Resistance of Baiye 1

比较了浙江省白化品种白叶1号返白阶段和主栽品种龙井43的低温抗性。结果表明,常温(25℃)环境下,返白期白叶1号反映光合能力的净光合速率Pn和最大羧化反应效率Vcmax都只有龙井43的70%~80%,而APX、POD等抗氧化酶活力比龙井43高30%以上。低温(2℃)处理24 h后,白叶1号反映光合能力的各项参数反而高于龙井43,同时其APX、POD、SOD活性也比龙井43分别高38.9%、33.3%、23.3%。说明白叶1号可能由于白化现象的产生,导致其抗氧化系统修复能力得到提高,因此在低温胁迫中,能够更为有效地清除叶片H2O2累积,缓解H2O2造成的氧化胁迫及光合抑制现象,具备比龙井43更好的低温耐受性。

The cold resistance was compared in two cultivars, the albino Baiye 1（Camellia sinensis cv. Baiye 1） during albinism period and Longjing 43（Camellia sinensis cv. Longjing 43） in Zhejiang province. The results showed that the net photosynthesis rate（Pn） and maximum carboxylation rate of Rubisco（Vcmax） in Baiye 1 during the albinism period were only 70%-80% of those in Longjing 43, but the activities of antioxidant enzymes APX and POD were both 30% higher than those in Longjing 43 under normal temperature. However, when they were treated under 2℃ condition for 24 h, various parameters related to photosynthesis were higher in Baiye 1 than Longjing 43. The activities of APX, POD and SOD were also 38.9%, 33.3% and 23.3% higher in Baiye 1. All the results indicated that the albinism phenomenon of Baiye 1 may lead to the improvement of antioxidant system, which would effectively reduce the H2O2 accumulation in tea leaves and alleviate oxidative damage and photosynthetic inhibition during cold stress. Therefore, Baiye 1 during albinism period may have a better cold resistance than Longjing 43.