Evaluation for Cold Tolerance of Sugarcane under Rain Frost Condition
In order to understand the characteristics of traits changes and evaluate the cold tolerance of sugarcane variety under the rain frost condition, the test was carried out in the frost zone - Ziyuan county, Guangxi province with 35 varieties (elites) coming from domestic and abroad. "Hie result showed that the damage under the rain frost was different from the drought frost. Under the condition about one third of below Ot accumulated temperature of drought frost, the damage for blades was the most, for cane of base stem was in the middle, for the cane of top stem was the less. The correlation analysis showed that: the traits under rain frost were only correlated with the emergence rate, brix and percent of green leaves, the value of correlation, however, was low; there was no correlation between damage rate of top stem length and percent of green leaves Sdamage rate of base stem intemode. Furthermore, the evaluation for cold tolerance of sugarcane under the rain frost condition would be more simple and reliable with traits of the damage rate of base stem internode and the percentage of + 1 - +4 green leaves according to analysis. Cold tolerance evaluation after clustering showed that: the varieties coming from south subtropical and tropical regions were not carried out cold tolerance identification in breeding program; the probability that the variety with good cold tolerance parents would have good cold tolerance will be not less than 40 % , and the probability that the variety without good cold tolerance parents would have poor cold tolerance will be higher than 70 %.
NETL
NSTL
万方数据
维普
