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Role of fixing nitrogen in common bean growth under water deficit conditions
Food and Energy Security ( IF 4.0 ) Pub Date : 2019-07-17 , DOI: 10.1002/fes3.183 Berhanu Amsalu Fenta 1 , Stephen E. Beebe 2 , Karl J. Kunert 3
Food and Energy Security ( IF 4.0 ) Pub Date : 2019-07-17 , DOI: 10.1002/fes3.183 Berhanu Amsalu Fenta 1 , Stephen E. Beebe 2 , Karl J. Kunert 3
Affiliation
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In common bean (Phaseolus vulgaris L), limited information is available if potential of nodulation and symbiotic nitrogen fixation is associated with the expression of traits that confer better adaptation to drought conditions. Adaptive traits were therefore measured in N‐fixing bean lines BAT 477, DOR 364, and PAN 185 and in nonnodulating lines BAT 477‐NN and DOR 364‐NN. Drought affected growth in all bean lines and decreased chlorophyll content but more in DOR 364‐NN and BAT 477‐NN, and also reduced nodule size with highest reduction in DOR 364 (21.6%). Loss of nitrogen fixation under drought conditions was further associated with lower water use efficiency, measured as carbon isotope ratio of 13C/12C, and lower %N in shoots when compared to capability to fix nitrogen. Loss of symbiotic nitrogen fixation in mutant bean lines DOR 364‐NN and BAT 477‐NN negatively affected root architectural traits under drought. Under drought conditions, line BAT 477‐NN had about 50% lower values for all root architectural traits, such as root angle, strongly emphasizing an association of capability to fix nitrogen with root development. An association between capability to fix nitrogen and maintaining a better harvest index and seed yield was also found in the study. Under well‐watered conditions, all N‐fixing lines had a higher harvest index and seed yield (2.6–2.8 t of seed yield/ha) in comparison with the two nonfixing bean lines (1.4 t/ha). Although the harvest index and seed yield declined due to drought in all tested lines, this decline was only significant for line DOR 364‐NN (harvest index) and lines DOR 364‐NN and BAT 477‐NN (seed yield). Our study has overall demonstrated an important association between the capability of maintaining atmospheric N‐fixation and expression of traits conferring better adaptation to drought conditions with any change in nitrogen fixation affecting these traits.
中文翻译：
缺水条件下固氮在普通豆生长中的作用
在普通豆（菜豆）中，如果结瘤和共生固氮的潜力与能够更好地适应干旱条件的性状相关联，则可获得的信息有限。因此，在N固定豆系BAT 477，DOR 364和PAN 185以及非结瘤系BAT 477-NN和DOR 364-NN中测量了适应性状。干旱影响了所有豆类的生长，降低了叶绿素含量，但在DOR 364-NN和BAT 477-NN中影响更大，还减少了根瘤大小，最大减少了DOR 364（21.6％）。以13 C / 12的碳同位素比测量，干旱条件下固氮的损失还与较低的水分利用效率有关。与固定氮的能力相比，芽中的碳和较低的％N。在干旱条件下，突变豆系DOR 364-NN和BAT 477-NN中共生氮固着力的丧失对根部建筑性状产生负面影响。在干旱条件下，BAT 477-NN品系的所有根部建筑性状（例如根部角度）的值均降低了约50％，强烈强调了固氮能力与根部发育之间的联系。在研究中还发现了固氮能力和保持更好的收获指数与种子产量之间的关联。在灌溉条件良好的条件下，与两个非固定豆系（1.4 t / ha）相比，所有固氮系都具有更高的收获指数和种子产量（2.6-2.8 t种子产量/公顷）。尽管所有测试品系的干旱导致收获指数和种子产量下降，该下降仅对DOR 364-NN（收获指数）品系和DOR 364-NN和BAT 477-NN（种子产量）品系显着。我们的研究总体上证明了维持大气氮固定的能力与性状的表达之间的重要联系，赋予了更好的干旱条件适应性，而固氮的任何变化都会影响这些性状。
更新日期：2019-07-17
中文翻译：
缺水条件下固氮在普通豆生长中的作用
在普通豆（菜豆）中，如果结瘤和共生固氮的潜力与能够更好地适应干旱条件的性状相关联，则可获得的信息有限。因此，在N固定豆系BAT 477，DOR 364和PAN 185以及非结瘤系BAT 477-NN和DOR 364-NN中测量了适应性状。干旱影响了所有豆类的生长，降低了叶绿素含量，但在DOR 364-NN和BAT 477-NN中影响更大，还减少了根瘤大小，最大减少了DOR 364（21.6％）。以13 C / 12的碳同位素比测量，干旱条件下固氮的损失还与较低的水分利用效率有关。与固定氮的能力相比，芽中的碳和较低的％N。在干旱条件下，突变豆系DOR 364-NN和BAT 477-NN中共生氮固着力的丧失对根部建筑性状产生负面影响。在干旱条件下，BAT 477-NN品系的所有根部建筑性状（例如根部角度）的值均降低了约50％，强烈强调了固氮能力与根部发育之间的联系。在研究中还发现了固氮能力和保持更好的收获指数与种子产量之间的关联。在灌溉条件良好的条件下，与两个非固定豆系（1.4 t / ha）相比，所有固氮系都具有更高的收获指数和种子产量（2.6-2.8 t种子产量/公顷）。尽管所有测试品系的干旱导致收获指数和种子产量下降，该下降仅对DOR 364-NN（收获指数）品系和DOR 364-NN和BAT 477-NN（种子产量）品系显着。我们的研究总体上证明了维持大气氮固定的能力与性状的表达之间的重要联系，赋予了更好的干旱条件适应性，而固氮的任何变化都会影响这些性状。
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