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Effects of Paclobutrazol and Ethephon on the Panicle Neck, Panicle Traits and Grain Filling of Foxtail Millet
YU Bingxing, WANG Hongfu, YANG Jing, DUAN Hongkai, WANG Yuyun, LI Zhi
In order to explore the best treatment of paclobutrazol and ethephon which can inhibit the greedy and excessive growth of plants without affecting the yield of foxtail millet, the Nongda 8 was used as the experimental material, and the randomized block design was adopted. Paclobutrazol and ethephon were sprayed on the leaves of foxtail millet at different growth stages, respectively, and the effects of single application[Paclobutrazol was sprayed befor jointing stage(A1), jointing stage(A2) and booting stage(A3), respectively. Ethephon was sprayed at booting stage(B1), heading stage(B2) and filling stage(B3).] and interaction(Those are A1B1, A1B2,A1B3,A2B1,A2B2,A2B3,A3B1,A3B2,A3B3) of two plant growth regulators on panicle neck, panicle traits and grain filling of Nongda 8 foxtail millet were investigated. The results showed that the panicle neck diameter and dry weight per centimeter of panicle neck was significantly improved with the single treatment of paclobutrazol and ethephon, but the other parameters of the panicle neck were not significantly different. The panicle diameter was significantly increased under A1 treatment, which was 5.39% higher than CK, and the panicle weight and grain weight of panicle were the highest under B2 treatment, which increased by 7.25% and 6.94% respectively compared with CK. There was no significant difference in panicle length and panicle code number. At the same time, the grain filling rate was improved, but the blighted grain rate did not change significantly. Under the interaction of paclobutrazol and ethephon, the panicle neck diameter, bending force and dry weight per centimeter of panicle neck of millet were increased significantly, while the bend moment, height of center gravity and water content of panicle neck decreased obviously. Compared with CK, the panicle length and panicle code number of millet decreased by 20.11% and 9.75% respectively, and the panicle diameter increased by 10.15% under A1B3 treatment. The panicle weight and grain weight of panicle reached the maximum under A2B2 treatment, which increased by 11.45% and 9.50% respectively compared with CK. With the increase of grain filling rate, the blighted grain rate decreased significantly, and reached the minimum under A2B2 treatment, which decreased by 50.00% compared with CK. The results showed that the interaction effect of the two regulators was more significant than that of single application, after spraying 300 mg·L
-1 paclobutrazol on the before jointing stage or jointing stage of foxtail millet, it is most suitable to pursue the application of 400 mg·L
-1 ethephon in heading or filling stage, while the application of ethephon at booting stages will decrease grain weight of panicle and yield decrease. The results of this study provided a theoretical basis for chemical regulation and high-yield cultivation of foxtail millet.
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