文献类型：期刊文献

英文题名：Selection for Low-Nitrogen Tolerance Using Multi-Trait Genotype Ideotype Distance Index (MGIDI) in Poplar Varieties

作者：Niu, Jinhong[1,2] Jia, Dongxu[1,2] Zhou, Zhenyuan[1,2] Cao, Mingrong[1,2] Liu, Chenggong[1,2] Huang, Qinjun[1,2] Li, Jinhua[1,2]

第一作者：Niu, Jinhong

通信作者：Li, JH[1];Li, JH[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[2]State Forestry & Grassland Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China

年份：2025

卷号：15

期号：7

外文期刊名：AGRONOMY-BASEL

收录：;Scopus(收录号：2-s2.0-105011860543);WOS:【SCI-EXPANDED(收录号:WOS:001549331600001)】；

基金：This research was funded by the National Key Research and Development Project during the 14th Five-Year Plan Period (2022YFD2200301).

语种：英文

外文关键词：poplar; low-nitrogen tolerance coefficient (LNindex); best linear unbiased prediction (BLUP); multi-trait index; nitrogen use efficiency (NUE)

摘要：The screening of poplar varieties that demonstrate tolerance to low nitrogen (N) represents a promising strategy for improving nitrogen-use efficiency in trees. Such an approach could reduce reliance on N fertilizers while mitigating environmental pollution associated with their cultivation. In this study, a total of 87 poplar varieties were evaluated in a controlled greenhouse pot experiment. Under both low-nitrogen (LN) and normal-nitrogen (NN) conditions, 18 traits spanning four categories-growth performance, leaf morphology, chlorophyll fluorescence, and N isotope parameters were measured. For 13 of these traits (growth, leaf morphology, chlorophyll fluorescence), genetic variation and parameters, including genotypic values, were analyzed using best linear unbiased prediction (BLUP) within a linear mixed model (LMM). LN tolerance of tested poplar varieties was comprehensively assessed with three MGIDI strategies by integrating means, BLUPs, and low-nitrogen tolerance coefficient (LNindex) to rank poplar varieties. The results exhibited highly significant differences across all traits between LN and NN experiments, as well as among varieties. LN stress markedly inhibited growth, altered leaf morphology, and reduced chlorophyll fluorescence parameters in young poplar plants. Among the selection strategies, the MGIDI_LNindex approach demonstrated the highest selection differential percent (SD% = 10.5-35.23%). Using a selection intensity (SI) of 20%, we systematically identified 17 superior genotypes across all three strategies. In a thorough, comprehensive MGIDI-based evaluation, these varieties exhibited exceptional adaptability and stability under LN stress. The selected genotypes represent valuable genetic resources for developing improved poplar cultivars with enhanced low-nitrogen tolerance.