Effect and Mechanism of Cold Tolerant Seed-Coating Agents on the Cold Tolerance of Early Indica Rice Seedlings

To better understand the effect and mechanism of cold tolerant seed-coating agents on the cold tolerance of rice seedlings, the physiological and biochemical effects of four cold tolerant seed-coating agents （HET, YKJ, YKZYJ, and the ABA seed coating agents） on two early indica rice varieties were studied under chilling stress. The results showed that the rice seedlings treated with cold tolerant seed-coating agents under chilling stress maintained dramatically higher root vigor, POD, CAT and SOD activities, and chlorophyll content, had lower MDA content and electrolyte leakage, and accumulated more soluble sugar and free proline, when compared with the control without the treatment, and finally showed lower plant injury rate. It was indicated that the cold tolerant seed coating agent improved the ability of rice seedlings in resisting to chilling stress. YKZYJ was ranked the first in terms of the efficiency in cold tolerance among the four cold tolerant seed-coating agents tested.

抗寒种衣剂包衣处理对水稻发芽和成苗特性的影响

【目的】探明抗寒种衣剂包衣处理对常温和低温环境下水稻发芽和成苗的影响.【方法】以湘早籼31号(常规稻)和Y两优1号(超级杂交稻)为材料,在华南农业大学研制成功的多成分、多功能的"齐苗快"浸种剂的基础上,结合黑龙江垦区常用拌种剂,添加杀菌杀虫剂、粘合剂等物质配备成种衣剂,设置未包衣浸种催芽(CK)、干种包衣(A)和浸种包衣(B)共3种处理方式,研究了抗寒种衣剂包衣处理对不同基因型水稻的发芽和成苗特性的影响.【结果和结论】结果表明:包衣处理后,在自然环境正常温度下,稻种发芽时间延长,但对种子发芽率有提高作用,对Y两优1号,干种包衣和浸种包衣处理分别比对照提高11.10%和16.55%,湘早籼31号分别提高了30.83%和37.68%;在低温环境下,稻种幼苗受到低温侵害后成苗率降低,但包衣处理相较于未包衣处理提高了稻种的成苗率,其中又以浸种包衣处理的成苗率最高,湘早籼31号和Y两优1号分别为54.95%、74.10%,相较于对照(CK)分别提高了120.24%、127.30%.同时,种衣剂包衣处理(A、B)提高了稻种秧苗受芽期低温侵害后的存活率,浸种包衣(B)处理提高了"二叶一心"期低温侵害后稻种秧苗的存活率.

抗寒生化制剂对棉花幼苗生理生化特性的影响

[目的]探讨抗寒制剂拌种处理对棉花的作用效果及机理,为其推广应用提供依据。[方法]用盆栽的方法研究在低温胁迫下经抗寒制剂拌种处理过的棉种发芽及生长情况,并考察棉苗的叶片相对含水量、蒸腾速率、叶绿素和脯氨酸含量等生理生化指标的变化情况。[结果]在常温和低温胁迫两种条件下,抗寒剂均可以提高棉种出苗率和增强幼苗长势,并均可增加棉株幼苗叶片的相对含水量、蒸腾速率和叶绿素含量,同时可促进渗透调节物质脯氨酸的积累,降低丙二醛的毒害,并增强过氧化氢酶的活性。其中在低温胁迫条件下,抗寒剂的促进效果更为明显。[结论]抗寒制剂能很好地促进棉种及棉苗的新陈代谢,增强其在低温下的抗逆性。