多效唑对高粱生长发育及生理的影响

Effects of Paclobutrazol on Growth and Physiology Characters of Sorghum

摘要:

为了解喷施多效唑对高粱（Sorghum bicolor）生长发育和生理的影响，在高粱品种‘农大红1号’拔节期喷施多效唑水溶液，对高粱的生长发育和生理指标进行了研究。结果表明，喷施不同浓度的多效唑后，高粱株高均比对照降低，基部节间长度缩短，茎粗增加，且穗粒重也提高。同时，高粱叶片的叶绿素含量和净光合速率提高，且抗氧化酶活性提高并降低了丙二醛含量。因此喷施多效唑可提高高粱的抗倒伏性，延缓叶片衰老，提高产量。在大田生产中，以拔节期喷施450~600 mg/L多效唑的效果较好。

Abstract:

In order to understand the effect of paclobutrazol on growth and physiology characters of sorghum (Sorghum bicolor), the variety ‘Nongdahong 1’ was sprayed different concentration paclobutrazol solution at jointing stage, the growth and physiological indexes were studied. The results showed that compared with the control, the plant height and basal internode length of sorghum decreased after sprayed paclobutrazol, and the stem diameter and ear grain weight increased. Therefore, paclobutrazol treatments could improve the lodging resistance of sorghum. Meanwhile, the chlorophyll content and net photosynthetic rate of leaves increased as well as the antioxidant enzyme activities, and the MDA content reduced. Therefore, spraying paclobutrazol could improve lodging resistance, delay leaf senescence and increase yield of sorghum. In the field production, spraying 450-600 mg/L at jointing stage was more effective.