不同海拔水稻耐冷特性研究

Study on Cold Tolerance of Rice at Different Altitudes

利用云南元阳梯田不同海拔的生态差异,以当地传统品种月亮谷和红脚老粳、现代品种楚粳27和合系22为材料,研究水稻耐冷特性。结果表明:(1)不同品种SOD活性均在1 850 m达到最高值;(2)红脚老粳在1 850 m其POD活性最高,而现代品种分别在中、低海拔最高;(3)传统品种CAT活性均在1 850 m达到最高值,而现代品种均在1 650 m达到最高值;(4)除楚粳27在1 450 m MDA含量最高外,其余品种均在1 850 m达最高值;(5)除合系22的可溶性蛋白含量在1 650 m最高外,其余品种均在1 850 m达到最高值;(6)红脚老粳和楚粳27的可溶性糖含量在1 850 m达到最高,月亮谷和合系22则在1 650 m海拔最高。说明高海拔环境使传统品种与现代品种均遭受到一定的氧化伤害,但是不同品种耐冷性指标变化规律不相一致。

Using ecological differences at different altitudes in Yuanyang Terrace Yunnan, the traditional varieties （Yuelianggu and Hongjiaolaojing） and the modern varieties （Chujing27 and Hexi22） as materials were used to study cold resistance of rice. The results showed that ： （ 1 ） Different varieties of SOD activity all reached the highest value at 1 850 m. （2） The POD activity of Hongjiaolaojing reached highest value when at 1 850 m altitude while the modem varieties respectively reached highest values at the lowest and middle altitude. （3） The CAT activity of traditional varieties reached the highest value at 1 850 m, while the CAT activity of modern varieties reached the highest value at 1 650 m. （4） In addition to Chujing27 was the highest content of MDA at 1 450 m, other varieties had reached the highest value at 1 850 m. （5） In addition to Hexi22 was the highest content of soluble protein at 1 650 m, other varieties had reached the highest value at 1 850 m. （6） The soluble sugar of Hongjiaolaojing and Chujing27 all reached highest value at 1 850 m. The soluble sugar of Yuelianggu and Hexi22 all reached highest value at 1 650 m. In conclusion, we can see that the growth environment of high altitude can bring oxydic damage to the traditional varieties and modem va- rieties inordinately. But the change rules of different varieties resistant to cold index are not consistent.