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Imbalance between nitrogen and potassium fertilization influences potassium deficiency symptoms in winter oilseed rape (Brassica napus L.) leaves 被引量:3
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作者 Jing Li Wenshi Hu +5 位作者 zhifeng lu Fanjin Meng Rihuan Cong Xiaokun Li Tao Ren Jianwei lu 《The Crop Journal》 SCIE CSCD 2022年第2期565-576,共12页
Chlorosis at leaf margins is a typical symptom of potassium(K) deficiency, but inappropriate application of K with other nutrients often masks symptoms of K deficiency. A two-year field experiment was conducted to mea... Chlorosis at leaf margins is a typical symptom of potassium(K) deficiency, but inappropriate application of K with other nutrients often masks symptoms of K deficiency. A two-year field experiment was conducted to measure the interactive effects of N and K on leaf photosynthesis and dry matter accumulation and the resulting growth dilution effect on K concentration and leaf K deficiency symptoms. N application aggravated the imbalance of N and K nutrients and further exacerbated K deficiency symptoms under K limitation. Synergistic effects of N and K promoted plant growth, amplified the growth dilution effect, and reduced the critical K concentration in leaves. Using 90% of the maximum shoot biomass as a threshold,the critical K concentration was 0.72% at the recommended N(N180) fertilization level. The critical K concentration increased by 62.5% owing to the reduced biomass under insufficient N(N;) supply. In contrast, high N(N;) reduced the critical K concentration(0.64%), accelerating chlorophyll decomposition and exacerbating K deficiency symptoms. The basis of changing the critical K concentration by magnifying growth dilution effect was the functional synergistic effect of N and K on photosynthetic characteristics. Under insufficient N, the low maximum carboxylation rate(V;) limited the net photosynthetic rate(An) and necessitated more K to maintain high CO;transmission capacity, to improve the total conductance g;/V;ratio. High N supply increased gtotand V;possibly mitigating the effect of K reduction on photosynthesis. In conclusion, it is unwise to judge K status of plants only by K concentration without accounting for crop mass(or dilution effect), critical K concentration and deficiency symptoms are affected by N fertilization, and the synergistic effect of N and K on leaf photosynthesis is the foundation of maximal growth of plants under diverse critical K concentrations. 展开更多
关键词 Potassium deficiency Nutrient equilibrium Dilution effect Critical K concentrations Photosynthetic characteristics
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钾营养状况介导的油菜叶片生长及其对叶际微生物的影响 被引量:1
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作者 宋毅 陈航航 +7 位作者 崔鑫 陆志峰 廖世鹏 张洋洋 李小坤 丛日环 任涛 鲁剑巍 《植物学报》 CAS CSCD 北大核心 2024年第1期54-65,共12页
为探究钾营养介导下的油菜(Brassica napus)叶片生长对叶际微生物群落的影响,利用田间试验,设置0、30和180 kg K_2O·hm^(-2) 3个钾肥用量,分别定义为K0 (钾缺乏)、K30 (钾不足)和K180 (钾充足) 3个钾营养水平。在苗期,分别选取典... 为探究钾营养介导下的油菜(Brassica napus)叶片生长对叶际微生物群落的影响,利用田间试验,设置0、30和180 kg K_2O·hm^(-2) 3个钾肥用量,分别定义为K0 (钾缺乏)、K30 (钾不足)和K180 (钾充足) 3个钾营养水平。在苗期,分别选取典型叶片测定其表型参数,并利用16S-RNA基因高通量测序测定油菜叶际微生物群落组成。结果表明,不同钾肥用量显著影响油菜叶片的钾含量,与K0相比,K30和K180处理钾含量分别提高66.7%和158.3%。不同钾营养状况下,油菜叶片结构和组分存在明显差异,叶片钾含量与叶面积及叶片可溶性糖、蔗糖、果糖和淀粉的含量呈显著正相关,而与叶片气孔密度呈显著负相关。钾肥施用显著影响油菜叶际微生物的多样性,与K0处理相比,施钾处理叶际微生物群落多样性指数显著升高,而K30和K180处理间无明显差异,但在群落的β多样性中,K30处理表现出更大的离散性。缺钾增加了油菜叶际变形菌门(Proteobacteria)的相对丰度,使得黄单胞菌科(Xanthomonadaceae)细菌显著富集。施用钾肥后细菌共现网络变简单,但促进了高丰度物种与其它物种的相互作用。通过联合分析油菜叶表型性状与叶际细菌群落,发现叶片糖组分(可溶性糖、蔗糖、果糖和淀粉)、干物质重以及叶面积是影响叶际细菌群落以及优势物种的关键因素。综上表明,施钾影响油菜叶片的物质组成,调控油菜叶际微生物群落结构,充足的钾营造的叶片微生物组“稳态”可能是钾营养增强作物生物胁迫抗性的潜在途径。 展开更多
关键词 钾营养 油菜 叶际微生物 气孔密度 蔗糖
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