草业科学2025，Vol.42Issue(1)：172-181,10.DOI:10.11829/j.issn.1001-0629.2023-0636
紫花苜蓿花芽分化过程及其对水分胁迫的响应
Flower bud differentiation in alfalfa and response to water coercion
摘要
Abstract
Plant flower bud differentiation is a prerequisite for seed production.Water is a crucial factor in maintaining normal physiological activities in plants,promoting flower bud differentiation,and ensuring seed development.In this study,the morphological differentiation characteristics of alfalfa flower buds and the effects of water stress on flower bud differentiation were evaluated in Medicago sativa'XinMu No.4'.The paraffin section method was used to analyze the morphological attributes of bud differentiation,differentiation stages,and the bud development process in alfalfa under normal irrigation and water stress.The results showed that:1)Based on the formation sequence of different primordia during flower bud development in alfalfa,the process of flower bud differentiation was divided into six stages according to the emerging order of each of the primordia of alfalfa:(Ⅰ)nutritive growth stage,(Ⅱ)floret primordial differentiation stage,(Ⅲ)sepal primordial differentiation stage,(Ⅳ)petal primordial differentiation stage,(Ⅴ)androgynophore primordial differentiation stage,and(Ⅵ)floral organ formation stage.2)Compared with normal irrigation,moisture stress treatment decreased the transverse(1.69％to 26.84％)and longitudinal diameters(2.51％to 23.49％)of the flower buds(P＜0.05).3)Water stress shortened the process of bud differentiation,causing bud differentiation to finish 4 days earlier,increasing the single order floret number.In summary,water stress shortens the process of flower bud differentiation in alfalfa,causing it to flower earlier,as well as increasing the number of florets/inflorescences,and water stress treatments may be considered during the flower bud differentiation period to regulate flowering time in production time.关键词
紫花苜蓿/花芽分化/水分/生殖生长/石蜡切片/形态特征/产量构成因子Key words
alfalfa/flower bud differentiation/moisture/reproductive growth/paraffin sectioning/morphological characteristics/yield component factors引用本文复制引用
杨静,隋晓青,石国庆,王鑫尧,王玉祥..紫花苜蓿花芽分化过程及其对水分胁迫的响应[J].草业科学,2025,42(1):172-181,10.基金项目
国家自然科学基金项目(31960354) （31960354）
新疆苜蓿良种繁育技术集成与应用项目(ZYYD2022C05) （ZYYD2022C05）
