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Physiological and Transcriptional Characteristics of Banana Seedlings in Response to Nitrogen Deficiency Stress

文献类型： 外文期刊

作者： Zhao, Lei 1 ; Cai, Bingyu 2 ; Zhang, Xiaohan 3 ; Zhang, Bencheng 1 ; Feng, Junting 2 ; Zhou, Dengbo 2 ; Chen, Yufeng 2 ; Zhang, Miaoyi 2 ; Qi, Dengfeng 2 ; Wang, Wei 2 ; Xie, Jianghui 2 ; Wei, Yongzan 2 ;

作者机构： 1.Hainan Univ, Sch Trop Agr & Forestry, State Key Lab Biol Breeding Trop Crops, Sanya 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, State Key Lab Biol Breeding Trop Crops, Haikou 571101, Peoples R China

3.Chinese Acad Trop Agr Sci, Sanya Res Acad, Sanya 572019, Peoples R China

关键词： banana; nitrogen deficiency; photosynthetic parameters; transcription level; phytohormone

期刊名称：HORTICULTURAE （ 影响因子：3.1； 五年影响因子：3.4 ）

ISSN：

年卷期： 2024 年 10 卷 3 期

页码：

收录情况： SCI

摘要： Nitrogen is a crucial element for the growth and development of plants, directly affecting crop growth and yield. To investigate the physiological and molecular mechanism of nitrogen-deficiency stress, we conducted an investigation into the effects of different nitrogen levels on the growth, photosynthetic characteristics, and gene transcription levels of banana seedlings. Compared with the control group with normal nitrogen levels (NN), the height of plants receiving Reduced-N (NR), Low-N (LN), and N-Free (NF) treatments was decreased by 0.45 cm, 2.5 cm, and 3.25 cm, respectively. Their dry weight was reduced by 1.63 g, 2.99 g, and 2.88 g, respectively. Conversely, the dry weight of the underground plant part in the LN and NF treatment groups exhibited an increase of 0.13 g and 0.16 g, respectively. Regarding photosynthetic characteristics, the Specialty Products Agricultural Division (SPAD) values of the NR, LN, and NF treatments showed reductions of 15.5%, 30.4%, and 35.9%, respectively, compared with those of the control treatments. The values of maximum photosynthetic efficiency (Fv/Fm), actual photosynthetic efficiency (Y(II)), and relative electron transfer (ETR) of the banana seedlings decreased to different degrees after NR, LN, and NF treatment, and their values were positively correlated with N levels. Gene transcription analysis showed that N transport-related proteins, including NRT1.7, NRT2.3a, NRT2.3b, and NRT2.5, were significantly up-regulated to increase the nitrogen absorption capacity of plant roots. On the other hand, various transcription factors including GRAS, MYB, and WRKY were notably up-regulated, facilitating root growth and the expanding root absorption area, thereby enhancing nitrogen uptake. Furthermore, genes associated with endogenous hormone metabolic pathways such as gibberellin (GA), strigolactone (SL), and brassinosteroids (BR) were activated in banana plants subjected to low nitrogen stress, enhancing the plant's ability to adapt to nitrogen-deficient conditions. These findings offer valuable insights into understanding the transcriptional regulatory mechanisms governing banana responses to low nitrogen stress and breeding new varieties with improved nutrient utilization.

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