Research Progress in Rice Leaf Lateral Asymmetry
Received date: 2025-04-24
Online published: 2025-09-11
Rice leaves, as the primary source of dry matter production and grain yield, exhibit a range of physiological functions, including photosynthesis, respiration, and transpiration. These leaves can be divided along the main vein, revealing distinct morphological and physiological traits on each side, such as variations in width, thickness, SPAD value, and nitrogen content, which manifest a striking and unique lateral asymmetry. Symmetry and asymmetry are widespread in nature, with biological asymmetry being categorized into three types: fluctuating asymmetry, directional asymmetry, and antisymmetry. Existing research has shown that rice leaf lateral asymmetry belongs to directional asymmetry, where one side of the main vein is wider, thicker, and rougher than the other, and also exhibits a lower SPAD value and nitrogen content. Moreover, the tillering characteristic of rice plants imparts a distinct location distribution to the lateral asymmetry of its leaves. Notably, within a rice population, the smooth side (the narrower and thinner side) of the leaf has an almost equal probability (approximately 50%) of appearing on either the left or the right. As such, the location distribution characteristics of rice leaf lateral asymmetry can be considered as exhibiting fluctuating asymmetry with an ideal distribution probability of 50%. Furthermore, certain regulatory genes that influence rice leaf width also affect the degree of rice leaf lateral asymmetry. One such gene is Leaf Lateral Symmetry 1 (LSY1), which has been clearly linked to rice leaf lateral asymmetry. In this paper, we review the progress of research on rice leaf lateral asymmetry from morphological, physiological, and genetic standpoints, and classify rice leaf transverse asymmetry into four levels: single leaf, single stem, single plant, and population. However, there is a limited amount of literature on rice leaf transverse asymmetry in the fields of crop science and plant physiology, and further exploration is needed to determine whether it significantly impacts rice yield and quality.
Key words： rice; leaf; asymmetry; morphological traits; physiological traits
LI Jie, XU Guiling, FEGN Yuehua, HUANG Yougang . Research Progress in Rice Leaf Lateral Asymmetry[J]. China Rice, 2025 , 31(5) : 33 -38 . DOI: 10.3969/j.issn.1006-8082.2025.05.005
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