5个海巴戟种质低温胁迫下的抗寒性评价

Evaluation of Cold Resistance of Five Accessions of Morinda citrifolia Linn Germplasm under Low Temperature Stress

笔者以东南亚收集到的野生海巴戟种质WT1a,WT1b,WT2,WT3和WT4为实验材料,通过室内模拟低温胁迫对5个海巴戟种质进行相关生理指标测定和分析,并运用隶属函数法对5个种质的抗寒性进行评价,结合田间的实验观察进一步验证5个海巴戟种质的抗寒能力。结果表明,相对电导率、MDA含量和POD酶活性可作为海巴戟抗寒性评价的参考指标;5个海巴戟种质中WT1a种质的抗寒能力最强,WT4的抗寒能力较差;通过数据的变化情况,推测低温胁迫后的4~6 d是海巴戟寒害发生的时间临界点。

Five accessions of wild germplasm of Morinda citrifolia Linn,WT1 a,WT1 b,WT2,WT3 and WT4,were collected in the Southeast Asia and used as experimental materials.They were treated indoor with low temperature to determine and analyze their physiological indexes.Cold resistance ability of the five accessions was evaluated by the membership function method,and then verified in field trials through experimental observation.The results showed that conductivity,MDA content and POD activity could be used as reference indices for evaluation of the cold resistance of M.citrifolia Linn.The accession WT1 a showed the highest cold resistance,while the accession WT4 had the lowest cold resistance.It is inferred that the time threshold for cold injury of M.citrifolia Linn be 4-6 days after low temperature stress was imposed on M.citrifolia Linn.