Sahoo Ranjan Kumar, Ansari Mohammad Wahid, Pradhan Madhusmita, Dangar Tushar K, Mohanty Santanu, Tuteja Narendra
a Plant Molecular Biology Group; International Centre for Genetic Engineering and Biotechnology; New Delhi, India.
Plant Signal Behav. 2014;9(7):e29377. doi: 10.4161/psb.29377.
The plant growth promoting rhizobacteria (PGPRs) as a biofertilizer provide agricultural benefits to advance various crops productivity. Recently, we discovered a novel Azotobacter vinellandii (SRIAz3) from rice rhizosphere, which is well competent to improve rice productivity. In this study, we investigated a role of A. vinellandii to confer salinity tolerance in rice (var. IR64). A. vinellandii inoculated rice plants showed higher proline and malondialdehyde content under 200 mM NaCl stress as compared with uninoculated one. The endogenous level of plant hormones viz., indole-3 acetic acid (IAA), gibberellins (GA3), zeatint (Zt) was higher in A. vinellandii inoculated plants under high salinity. The fresh biomass of root and shoot were relatively elevated in A. vinellandii inoculated rice. Further, the macronutrient profile was superior in A. vinellandii inoculated plants under salinity as compared with non-inoculated plants. The present findings further suggest that A. vinellandii, a potent biofertilzer, potentially confer salinity stress tolerance in rice via sustaining growth and improving compatible solutes and nutrients profile and thereby crop improvement.
作为生物肥料的植物促生根际细菌（PGPRs）为提高各种作物的生产力带来了农业效益。最近，我们从水稻根际发现了一种新型的维氏固氮菌（SRIAz3），它在提高水稻生产力方面表现出色。在本研究中，我们调查了维氏固氮菌在赋予水稻（品种IR64）耐盐性方面的作用。与未接种的水稻植株相比，接种维氏固氮菌的水稻植株在200 mM NaCl胁迫下脯氨酸和丙二醛含量更高。在高盐度条件下，接种维氏固氮菌的植株中植物激素（即吲哚 - 3 - 乙酸（IAA）、赤霉素（GA3）、玉米素（Zt））的内源水平更高。接种维氏固氮菌的水稻根和地上部分的鲜生物量相对增加。此外，与未接种的植株相比，接种维氏固氮菌的植株在盐胁迫下的大量营养素状况更优。目前的研究结果进一步表明，维氏固氮菌作为一种有效的生物肥料，可能通过维持生长、改善相容性溶质和营养状况，从而赋予水稻耐盐胁迫能力，进而实现作物改良。
