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Phenological Stage and Nitrogen Input Coordinately Regulate Bud Bank Dynamics and Shoot Allocation in an Alpine Clonal Perennial Grass

文献类型： 外文期刊

作者： He, Keyan 1 ; Zhou, Qingping 3 ; He, Lin 1 ; He, Lili 1 ; Dang, Haihong 1 ; Wei, Xiaoxing 1 ; Wang, Qian 4 ; Wang, Jiahao 5 ;

作者机构： 1.Qinghai Univ, Qinghai Acad Anim Sci & Vet Med, Xining 810016, Peoples R China

2.Qinghai Univ, Lab Germplasm Res & Utilizat Qinghai Tibet Plateau, Xining 810016, Peoples R China

3.Southwest Minzu Univ, Coll Grassland Resources, Chengdu 610041, Peoples R China

4.Qinghai Univ, State Key Lab Sanjiangyuan Ecol & Plateau Agr & An, Xining 810016, Peoples R China

5.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China

关键词： belowground bud bank; nitrogen addition; phenological stage; shoot allocation; Qinghai-Tibet Plateau

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 14 期

页码：

收录情况： SCI

摘要： Belowground buds play a vital role in the clonal propagation and structural regulation of perennial herbaceous plants, especially in alpine environments, where vegetative renewal depends heavily on bud bank dynamics. However, the interactive effects of nitrogen addition and phenological stages on bud development and aboveground branching remain poorly understood. In this study, we examined the responses of rhizome buds, tiller buds, and aboveground tiller types of Kentucky bluegrass to six nitrogen levels (0, 6, 9, 12, 15, and 18 g/m2) across five growth stages on the Qinghai-Tibet Plateau. The results showed that moderate nitrogen input (N2, 9 g/m2) significantly enhanced total bud density, particularly at the heading and maturity stages, indicating a threshold response. Aboveground reproductive tiller density peaked at N2 (9 g/m2), while vegetative and total tiller densities plateaued beyond N3 (12 g/hm2), suggesting a diminishing marginal effect of nitrogen on aboveground tiller density. Furthermore, bud density showed stage-specific correlations with tiller types: vegetative tillers were primarily influenced at the heading stage, and reproductive tillers were mainly influenced at the mature stage, with weakened associations in senescence. These findings highlight the phenological specificity and non-linear response of clonal grass regeneration to nitrogen input and provide a theoretical basis for optimizing nutrient management in cold alpine grasslands.

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