干旱胁迫、施氮和基因型对玉米产量和叶绿素荧光的影响

Journal of trace elements and minerals Pub Date : 2025-03-21 DOI:10.1016/j.jtemin.2025.100237

Mansour Halimi Soufi, Hamid Reza Mobasser, Ahmad Mehraban, Hamid Reza Ganjali, Khaled Miri

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引用次数: 0

摘要

干旱胁迫条件下玉米（Zea mays L.）的生理和生产受到土壤氮和植株基因型的重要影响。因此，干旱胁迫和施氮对玉米产量和叶绿素荧光的影响尚不清楚，这是本研究的目的。方法采用随机完全区组设计（RCBD）的分割图，于2020年在两个试验点进行4个重复试验。试验了干旱胁迫水平（主区），包括蒸发盘A级蒸发70 mm后灌溉、开花时停止灌溉、灌浆和开花灌浆同时灌浆、施氮（小区），包括对照(0)、100、200、300 kg ha-1和玉米基因型（小区），包括Kusha 201 （G1）、Fajr 260 （G2）和Dehghan 400 （G3）。测定了不同玉米形态（穗轴直径，CDM）、产量（生物产量，BY和收获指数，HI）和荧光指数（Fo, Fm， Fv和Fv/Fm）。结果尽管干旱胁迫显著降低了CDM、生物产量和荧光指标，但施氮（N300）缓解了胁迫，G1具有较高的BY， G3具有较低的CDM（中等）和较高的HI和Fo。干旱胁迫与施氮显著的交互作用表明，不同干旱胁迫水平下，玉米基因型对施氮的响应不同。结论根据不同的胁迫强度，确定适宜的施氮水平和基因型可获得最优产量。

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Corn (Zea mays L.) production and chlorophyll fluorescence affected by drought stress, N fertilization, and genotype

Background

Corn (Zea mays L.) physiology and production in drought stress conditions may be importantly affected by soil N and plant genotype.

Objective

So, more has yet to be indicated on how drought stress and N fertilization may affect production and chlorophyll florescence of corn genotypes as the objective of the present research.

Methods

The experiment was a split plot on the basis of a randomized complete block design (RCBD) with four replicates conducted in two research sites in 2020. Drought stress levels (main plots) including irrigation after 70 mm evaporation from evaporating pan Class A, irrigation stoppage at flowering, grain filling and both flowering and grain filling, N chemical fertilization (sub plots) including control (0), 100, 200, 300 kg ha^-1 and corn genotypes (sub-sub plots) including Kusha 201 (G1), Fajr 260 (G2), and Dehghan 400 (G3) were tested. Different corn morphological (cob diameter, CDM), yield (biological yield, BY, and harvest index, HI) and florescence indices (Fo, Fm, Fv, and Fv/Fm) were determined.

Results

Although drought stress significantly decreased CDM, biological yield, and fluorescence indices, N fertilization (N300) alleviated the stress and G1 had higher BY, and G3 had less CDM (medium) and higher HI and Fo. The significant interaction of drought stress and N fertilization indicates, depending on the level of drought stress, the response of corn genotypes to N fertilization is different.

Conclusion

Depending on stress intensity, determination of appropriate level of N feralization and genotype may result in the most optimum yield production.

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来源期刊

Journal of trace elements and minerals Medicine and Dentistry (General), Analytical Chemistry, Environmental Science (General), Toxicology, Biochemistry, Genetics and Molecular Biology (General), Nutrition, Veterinary Science and Veterinary Medicine (General)

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审稿时长

65 days