Variation in growth and ion uptake of maize due to inoculation with plant growth promoting rhizobacteria under salt stress
Variation in growth and ion uptake of maize due to inoculation with plant growth promoting rhizobacteria under salt stress
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盐胁迫下接种促进植物生长的根际细菌导致玉米生长和离子吸收的变化
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Arshad
中科院分区：
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作者：
S. Nadeem;Z. Zahir;M. Naveed;M. Arshad
土壤盐渍化不仅会导致植物体内养分失衡，还会降低植物的生长和光合作用。植物根际促生菌（PGPR）可以通过产生多种激素和提高土壤基质中养分的有效性来诱导植物耐盐。采用盆栽试验研究了盐胁迫条件下不同PGPR菌株对玉米生长和离子吸收的影响。三个盐度水平（4，8和12 dSm-1）沿着与原来的EC在盆中使用NaCl盐。将用预选菌株（S5、S15和S20）接种的玉米种子与未接种的对照沿着播种在盆中。施用推荐剂量的NPK。总体而言，玉米生长随盐度的增加而下降。结果表明，即使在较高EC（12 dSm-1）下，接种PGPR也能显著提高黄瓜地上部/根鲜重、地上部/根干重、叶绿素a、B和类胡萝卜素含量，分别为对照的64/114、102/102、154、102和58%;与对照相比，接种抑制了地上部Na + /Cl -的吸收，促进了地上部N、P、K的积累。在所选的三个菌株中，S20在所有EC水平上表现更好。菌株S20的生长促进作用和离子吸收能力的提高可能与其较高的IAA产量、几丁质酶活性、P-溶解能力和较强的根定殖能力有关。
Soil salinity decreases plant growth and photosynthetic activity besides resulting in nutrient imbalance in plants. Plant growth promoting rhizobacteria (PGPR) can induce plant tolerance to salinity by producing various hormones and enhancing the availability of nutrients from soil matrix. A pot study was conducted to evaluate the effect of different PGPR strains on maize growth and ions uptake under salt stress conditions. Three salinity levels (4, 8 and 12 dSm -1) along with original EC were maintained in the pots using NaCl salt. Maize seeds inoculated with pre-selected strains (S5, S15 and S20) along with uninoculated control were sown in the pots. Recommended doses of NPK were applied. In general, maize growth was decreased with the increase in salinity. Results indicated that PGPR inoculation, even at higher EC (12 dS m -1 ), significantly increased shoot/root fresh weight, shoot/root dry weight, chlorophyll a, b and cartenoid contents upto 64/114, 102/102, 154, 102 and 58%, respectively, compared with un-inoculated control. Similarly, inoculation restricted the uptake of Na + /Cl - ions and enhanced the accumulation of N, P and K in shoot compared to control. Among the three selected strains, S20 performed better at all EC levels. The growth promotion and increased ions uptake exhibited by strain S20 might be due to its high in vitro IAA production, chitinase activity, P-solubilition and more intensive root colonization, besides ACC-deaminase activity.