Adaptations of Rice for Wet Environments | 水稻对湿润环境的适应

📚 Adaptations of Rice for Wet Environments | 水稻对湿润环境的适应

Rice (Oryza sativa) is unusual among cereals because it can grow in waterlogged paddy fields where oxygen availability in the soil is severely limited. This article explains the structural, physiological and biochemical adaptations that allow rice roots and shoots to survive, grow and reproduce in wet environments. Understanding these adaptations is a common A-level Biology topic linking plant anatomy, respiration and plant hormones.

水稻是一种不寻常的谷物，因为它能在土壤氧气严重不足的淹水稻田中生长。本文解释使水稻根和茎能在湿润环境中存活、生长和繁殖的结构、生理和生化适应。理解这些适应是 A-level 生物学的常见主题，涉及植物解剖、呼吸作用和植物激素。

1. Aerenchyma Tissue and Oxygen Transport | 通气组织与氧气运输

Waterlogged soil has very little oxygen because water fills the air spaces between soil particles and microorganisms rapidly consume the remaining oxygen. Roots still need oxygen for aerobic respiration, so rice plants form aerenchyma, a spongy tissue containing large interconnected air spaces.

淹水土壤中氧气非常少，因为水填满土壤颗粒之间的空隙，微生物也迅速消耗剩余的氧气。根系仍然需要氧气进行有氧呼吸，因此水稻形成通气组织，一种含有大型相互连通气腔的海绵状组织。

In rice, cortical cells in the root and stem undergo programmed cell death to create continuous air channels. These channels connect the aerial parts of the plant to submerged roots, allowing oxygen to diffuse down its concentration gradient from the atmosphere to root cells.

水稻根和茎的皮层细胞通过程序性细胞死亡形成连续的气体通道。这些通道将地上部分与水下根连接起来，使氧气能够沿浓度梯度从大气扩散到根细胞。

Aerenchyma also reduces

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