多效唑对降香黄檀容器苗抗寒性的影响研究

以降香黄檀当年生容器苗为试材，进行不同浓度、施用方式和施用时间的多效唑处理试验，分析降香黄檀越冬期间的生长和生理指标，探讨降香黄檀容器苗的越冬生长、抗寒生理响应的最佳处理方式。结果表明：不同多效唑处理下的苗木高径比下降值、根冠比和木质化普遍高于CK，幼苗叶片的可溶性糖、可溶性蛋白含量和超氧化物歧化酶活性相比CK显著提高，丙二醛和相对电导率相比CK显著下降。因此，11月15日土施1 000 mg/L、11月30日叶喷1 500 mg/L和11月15日叶喷1 000 mg/L多效唑溶液为效果较好的3种处理方式。

Effect of Paclobutrazol on Cold-resistance of Dalbergia odorifera Container Seedlings

The one-year container seedlings of Dalbergia odorifera were treated with different concentrations, alternative methods and treatment time of paclobutrazol. The growth and physiological indexes during overwintering were analyzed, and the optimal treatments of the seedlings for the overwintering growth and physiological responses to cold were explored. The results showed that the decrease value of height-to-diameter ratio and shoot-to-root ratio and lignification of the seedlings treated with different paclobutrazol were higher than those of CK. It was observed that soluble sugar, soluble protein content and SOD activity of the leaves increased, but MDA and relative conductivity decreased compared to CK. Based on our comprehensive evaluations, it appeared that the effect of 1 000 mg/L of soil application on November 15 and 1 500 mg/L on November 30 and 1 000 mg/L of leaf spray on November 15 produced better results.