Effect of seed source, light, and nitrogen levels on biomass and nutrient allocation pattern in seedlings of Pongamia pinnata
Effect of seed source, light, and nitrogen levels on biomass and nutrient allocation pattern in seedlings of Pongamia pinnata
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DOI：
10.1007/s11356-020-11734-8
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发表时间：
2020-11
影响因子：
5.8
通讯作者：
G. Sahoo;S. L. Swamy;A. Mishra;T. Thakur
中科院分区：
文献类型：
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作者：
G. Sahoo;S. L. Swamy;A. Mishra;T. Thakur
氮(N)和光是植物生长和生产力的关键决定因素。本研究试图量化光、氮水平和种子来源对水仙幼苗生长、生物量、养分分配和养分利用效率(NUE)的潜在机制和影响。此外，还检查了差异和固定假设以及等长和异速生长关系。6个形态优良的种源OFP。对印度三种不同农业气候条件下的品娜进行了母圃两个水平的N(低剂量5g植株−1和15g植株−1)和光照(全光-100%和弱光-50%)处理的评价。在种源中，本地莱布尔种源在生长、生物量和养分利用效率方面表现突出。氮素对幼苗生长的促进作用比光照更为关键。品纳塔。高氮和高光处理增加了冠根比。这些成分表现出异速生长，并遵循不同的分配模式。开发适宜的遗传资源，并结合管理措施，是发展优质栽植砧木的必要手段。品纳塔。养分利用效率、生物量生产及其分配是选择的重要指标和标准。研究表明，具有较高氮效率的莱布尔和贾巴尔普尔种源应在充足的氮肥施用量(15g植株−1)和光照条件下种植。
Nitrogen (N) and light are critical determinants of plant growth and productivity. The present study attempts to quantify the underlying mechanisms and effects of light, N levels, and seed source on growth, biomass, nutrient allocations, and nutrient use efficiencies (NUEs) in seedlings ofPongamia pinnata. The differential and fixed hypothesis and isometric and allometric relationships were also examined. Six morphologically superior seed sources ofP. pinnatafrom three contrasting agro-climatic conditions of India were evaluated with application of two levels of both N (low dose @ 5g plant−1and 15 g plant−1) and light regimes (full light-100% and low light-50%) in mother nursery. Among the seed sources, the native Raipur seed source was found outstanding in growth, biomass, and nutrient use efficiency. N was more critical than light in promoting growth in seedlings ofP. pinnata. High N and high light regimes increased shoot/root ratios. The components showed allometric growth and followed a differential allocation pattern. The exploitation of suitable genetic resources combined with managerial interventions is necessary for development of quality planting stock ofP. pinnata. Nutrient use efficiencies, biomass production, and their allocation were important indicators and criteria for selection. The study suggests that Raipur and Jabalpur seed sources having high NUE should be grown along with adequate N application (15 g plant−1) and light conditions.