Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, 60800, Punjab, Pakistan.
Sci Rep. 2019 Apr 12;9(1):5999. doi: 10.1038/s41598-019-42374-9.
Besides other deleterious effects, drought elevates ethylene level too in plants. Increased ethylene concentration reduces root elongation and development that consequently retard plant growth and yield. There are certain PGPR which produce ACC-deaminase. The ACC-deaminase converts ACC (an immediate precursor of ethylene biosynthesis in methionine pathway in higher plants) into ammonia and α-ketobutyrate instead of ethylene. Regularization of ethylene level in plants mitigate the effects of drought. On the other hand, biochar has been reported to be rich in nutrients and exhibiting higher water holding capacity. So, a pot study was conducted with the hypothesis that the combined application of ACC-deaminase producing PGPR and biochar would minimize the drought effects on wheat growth. The ACC-deaminase producing PGPR were applied on wheat seeds in combination with two biochar doses. Three moisture levels were maintained throughout the trial. The data obtained revealed that B. amyloliquefaciens + 2BC improved the chlorophyll a, chlorophyll b, photosynthetic rate, transpiration rate, 100-grain weight, and grain N, P and K up to 114%, 123%, 118%, 73%, 59%, 58%, 18% and 23%, respectively, under drought conditions. It is concluded that co-application of PGPR and biochar is an effective technique to mitigate the drought effects.
除了其他有害影响外，干旱还会导致植物中乙烯水平升高。乙烯浓度的增加会减少根的伸长和发育，从而减缓植物的生长和产量。某些 PGPR 会产生 ACC 脱氨酶。ACC 脱氨酶将 ACC（高等植物蛋氨酸途径中乙烯生物合成的直接前体）转化为氨和α-酮戊二酸，而不是乙烯。植物中乙烯水平的正常化可以减轻干旱的影响。另一方面，生物炭被报道富含营养物质，并表现出更高的持水能力。因此，进行了一项盆栽研究，假设联合应用产生 ACC 脱氨酶的 PGPR 和生物炭将最大限度地减少干旱对小麦生长的影响。将产生 ACC 脱氨酶的 PGPR 与两种生物炭剂量一起应用于小麦种子上。在整个试验过程中保持三个水分水平。获得的数据表明，在干旱条件下，B. amyloliquefaciens + 2BC 可将叶绿素 a、叶绿素 b、光合速率、蒸腾速率、百粒重和籽粒氮、磷、钾分别提高 114%、123%、118%、73%、59%、58%、18%和 23%。结论是，联合应用 PGPR 和生物炭是减轻干旱影响的有效技术。
