Growth, yield and aerenchyma formation of sweet and multipurpose sorghum (Sorghum bicolor L. Moench) as affected by flooding at different growth stages
Growth, yield and aerenchyma formation of sweet and multipurpose sorghum (Sorghum bicolor L. Moench) as affected by flooding at different growth stages
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不同生长阶段洪水对甜多用途高粱（Sorghum bicolor L. Moench）生长、产量和通气组织形成的影响
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发表时间：
2011
影响因子：
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通讯作者：
A. Younger
中科院分区：
文献类型：
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作者：
A. Promkhambut;A. Polthanee;C. Akkasaeng;A. Younger
温室实验是 RCB 设计中的 4 × 2 阶乘实验，重复四次。在营养早期(EV)、生殖早期(ER)和生殖中期(MR)进行3次淹水处理。使用非淹没对照组。研究的两种拟议的生物能源高粱类型是甜高粱（Wray）和多用途高粱（SP1）。结果表明，EV和ER淹水均显着降低了两个品种的株高、茎粗、叶面积、叶干重、地上部干重、初生根长度和根干重。然而，MR 与对照没有显着差异。两个品种中，在 EV 处施用淹水时，节根数量受到限制，但 ER 和 MR 处的节根数量比对照有所增加。在 ER 淹没的雷中，在土壤表面以上的水中发育的根长和根干重显着更高。在两个品种中，水淹植物的节根和侧根中都形成了通气组织空间，其数量显着最高，形成于 EV 期间。通气组织在位于土壤上方的根部比位于土壤中的根部更发达。甜高粱的根部和茎基部比多用途高粱有更多的通气组织空间。收获时，发现对 EV 和 ER 进行淹水显着降低了两个品种的茎产量。雷河 (Wray) 受 MR 洪水影响最小。这些发现表明，两种高粱类型都容易受到 EV 洪水的影响。从生育后期茎粗和高度的恢复能力来看，甜高粱比多用途高粱更耐淹。根和茎基部的节根发育和通气组织形成可能是对洪水的重要适应反应。
The greenhouse experiment was a 4 × 2 factorial in a RCB design with four replications. Three flooding treatments were applied at the early vegetative stage (EV), early reproductive stage (ER) and mid reproductive stage (MR). A non-flooded control group was used. Two proposed bioenergy sorghum types studied were sweet sorghum (Wray) and multipurpose sorghum (SP1). The results showed that plant height, stem diameter, leaf area, leaf dry weight, shoot dry weight, primary root length and root dry weight of both cultivars were significantly reduced by flooding at EV and ER. However, there was no significant difference from the control at MR. Nodal root number were restricted when flooding was applied at EV but increased over the control at ER and MR in both cultivars. Root length and root dry weight, developed in water above soil surface, were significantly higher in Wray flooded at ER. In both cultivars, aerenchyma spaces were formed in the nodal and lateral roots of the flooded plants with the significantly highest number, forming during EV. Aerenchyma was more developed in roots, located above the soil, than in those located in the soil. There were more aerenchyma spaces in the sweet sorghum’s roots and stalk bases than in the multipurpose sorghum. At harvest, it was found that flooding applied at EV and ER had significantly reduced the stalk yield of both cultivars. The Wray had been the least affected by flooding at MR. These findings suggest that both sorghum types are susceptible to flooding at EV. Judging from the recovery capacity of stem diameter and height at a later growth stage, sweet sorghum was more tolerant to flooding than multipurpose sorghum. Nodal root development and aerenchyma formation in roots and stalk bases may be important acclimation responses to flooding.