Early flower bud loss and mepiquat chloride effects on cotton yield distribution
Early flower bud loss and mepiquat chloride effects on cotton yield distribution
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DOI：
10.2135/cropsci2000.4061678x
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发表时间：
2000-11-01
期刊：
影响因子：
2.3
通讯作者：
Kennedy, CW
中科院分区：
文献类型：
--
作者：
Cook, DR;Kennedy, CW
原棉的脱落或败育，花蕾或铃状花序增加了在相邻或随后的结果位置上保留果实的重要性。使用植物生长调节剂甲哌喹氯化物（MC）（N，N二甲基哌啶氯化物）改善棉铃在下部生殖枝（合轴）上的保持，减少营养生长，并且在某些情况下降低上部合轴生产力。我们的目的是确定MC的剂量和施用时间以及不同水平的早期新芽去除对植株内产量分布的影响。零或平均两个或四个花蕾位于较低的合轴的第一位置被删除之前，MC应用程序在1992年的两个字段的位置从每株植物。这种芽损失导致较高的保留在第二个位置上较低的合轴和略高的合轴。两个双周剂量的24.5克公顷（-1）的MC在开花早期应用：也提高了补偿和产量较低的合轴第二位。首先在一个地点，当芽长1 cm时开始，每周4次12.25 g ha（-1）的MC剂量导致单轴分支产量增加，当有中度早期芽损失时。根据现场的位置，一个或其他的MC治疗减少了结果的位置和产量较高的合轴时，水果保留较低的合轴是高的。早期芽的损失，导致营养生长的小幅度增加，改善了这种效果。早期芽损失和MC处理产生的生物学反应正交互作用。在早期芽损失后，用MC处理的植物通常改善对下部合轴的补偿，而对上部合轴没有负面影响。
Abscission or abortion of the initial cotton (Gossypium hirsutum L.) flow er buds or bells increases the importance of retaining fruit on adjacent Or subsequent fruiting positions. Use of the plant growth regulator mepiquat chloride (MC) (N, N dimethylpiperidinium chloride) improves boll retention on lower reproductive branches (sympodia), reduces vegetative growth, and in some cases reduces upper sympodial productivity. Our objective was to determine the effect of doses and application timings of MC and different levels of early newer bud removal on within-plant yield distribution. Zero or an average of two or four flower buds located at first positions on lower sympodia were removed from each plant prior to MC applications at two field locations in 1992. This bud loss resulted in higher retention at second positions on lower sympodia and on slightly higher sympodia. Two biweekly doses of 24.5 g ha(-1) of MC applied at early bloom: also enhanced compensation and yield on lower sympodial second positions. Primarily at one location, four weekly MC doses of 12.25 g ha(-1) each beginning when buds were 1 cm long resulted in increased monopodial branch yield when there was moderate early bud loss. Depending on field location, one or the other of the MC treatments reduced the number of fruiting positions and yield on higher; sympodia when fruit retention on lower sympodia was high. Loss of early buds, which resulted in small increases in vegetative growth, ameliorated this effect. The biological responses produced by early bud loss and MC treatments interacted positively. After early bud loss, plants treated with MC generally improved compensation on lower sympodia without negative effects on upper sympodia.