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Morphological and physiological plasticity response to low nitrogen stress in black cottonwood (Populus deltoides Marsh.)
Journal of Forestry Research ( IF 3 ) Pub Date : 2021-06-04 , DOI: 10.1007/s11676-021-01338-4
Cun Chen , Yanguang Chu , Qinjun Huang , Changjun Ding , Weixi Zhang , Bo Li , Jing Zhang , Xiaohua Su

It is important to evaluate nitrogen use efficiency and nitrogen tolerance of trees in order to improve their productivity. In this study, both were evaluated for 338 Populus deltoides genotypes from six provenances. The plants were cultured under normal nitrogen (750 μM NH4NO3) and low nitrogen (5 μM NH4NO3) conditions for 3 months. Growth, chlorophyll content and glutamine synthetase activity of each genotype were measured. Under low nitrogen, heights, ground diameter, leaf area, leaf and root biomass, and chlorophyll contents were significantly lower than those under normal nitrogen level. Correlation analysis showed that nutrient distribution changed under different nitrogen treatments. There was a negative correlation between leaf traits and root biomass under normal nitrogen level, however, the correlation became positive in low nitrogen treatment. Moreover, with the decrease of nitrogen level, the negative correlation between leaf morphology and chlorophyll levels became weakened. The growth of the genotypes under the two treatments was evaluated by combining principal component analysis with a fuzzy mathematical membership function; the results showed that leaf traits accounted for a large proportion of the variation in the evaluation model. According to the results of comprehensive evaluation of plants under the two treatments, the 338 P. deltoides genotypes could be divided into nine categories, with wide genotypic diversity in nitrogen use efficiency and low nitrogen tolerance. As a result, 26 N-efficient genotypes and 24 N-inefficient genotypes were selected. By comparative analysis of their morphological and physiological traits under the two treatments, leaf traits could be significant indicators for nitrogen use efficiency and nitrogen tolerance, which is of considerable significance for breeding poplar varieties with high nitrogen use efficiencies.



中文翻译:

黑杨木 (Populus deltoides Marsh) 对低氮胁迫的形态和生理可塑性响应

重要的是要评估树木的氮利用效率和氮耐受性,以提高其生产力。在这项研究中,对来自六个来源的338 种杨树基因型进行了评估。植物在常氮(750 μM NH 4 NO 3)和低氮(5 μM NH 4 NO 3) 条件 3 个月。测量每个基因型的生长、叶绿素含量和谷氨酰胺合成酶活性。低氮条件下,高度、地径、叶面积、叶和根生物量、叶绿素含量显着低于正常氮水平。相关分析表明,不同施氮处理下养分分布发生了变化。在正常氮水平下,叶片性状与根生物量呈负相关,而在低氮处理下呈正相关。此外,随着氮水平的降低,叶片形态与叶绿素水平之间的负相关性减弱。结合主成分分析和模糊数学隶属函数评价两种处理下基因型的生长情况;结果表明,叶片性状在评价模型的变异中占很大比例。根据两种处理下植物综合评价结果,338P. deltoides基因型可分为九类,氮利用效率的基因型多样性广泛,氮耐受性低。结果,选择了26个N有效基因型和24个N无效基因型。通过对两种处理下杨树形态和生理性状的比较分析,叶片性状可以作为氮素利用效率和氮素耐受性的重要指标,对选育高氮素利用效率杨树品种具有重要意义。

更新日期:2021-06-04
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