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叶面喷施N-乙酰-L-半胱氨酸对机插水稻缓苗的调节效应.
- Source :
-
Journal of Nanjing Agricultural University / Nanjuing Nongye Daxue Xuebao . 2020, Vol. 43 Issue 3, p605-612. 8p. - Publication Year :
- 2020
-
Abstract
- [Objectives] The study aimed to explore the effect of foliar spraying N-acetyl-L-cysteine ( NAC) on the recovery of machine-transplanted rice. [Methods]The conventional japonica rice'Ningjing 7'was used as the experimental variety and sprayed to seedling leaves with different concentrations of NAC for 2 times at 2 days before transplanting. And 4 treatments were set:spraying water( CK); spraying 20 μmol􀅰L-1 NAC( F-NAC20 ); spraying 200 μmol􀅰L-1 NAC( F-NAC200 ); spraying 2 000 μmol􀅰L-1 NAC (F-NAC2000 ). Then the tillers growth, morphological index( plant height, stem base width, root morphology index), chlorophyll content, antioxidant system(SOD, POD, CAT activities), AsA-GSH pool( APX, GR activities and AsA, GSH contents) and MDA, H2O2 contents were investigated. [Results]The results showed that NAC could reduce H2O2 content through significantly increasing GR activity and promoting the accumulation of GSH which alleviated the oxidative damage, maintained cell stability, reduced MDA content, protected photosynthetic organs, reduced chlorophyll degradation, and significantly promoted root growth and elongation, and significantly increased the number of panicles at maturity. At 2 d after transplanting, compared with CK, F-NAC2000 increased GR activity by 6.4%, GSH content by 92.2%, decreased H2O2 content by 25.7%, and MDA content by 26.3%, which reduced photosyn- thetic pigment degradation and increased chlorophyll content by 19.3%, increased carotenoid content by 36.6%, and the number of root tips increased 164.7%, root length increased 101.0%, root diameter increased 26.8%. The growth of the seedlings after trans- planting was improved. At 7 d after transplanting, the number of tillers increased 2.3% compared with CK, and the number of pani- cles per plant was 0.4 more than that of CK. [Conclusions]Foliar application of NAC can alleviate the negative effects of transplant shock on seedlings, shorten the recovery stage, and promote the growth of tillering after transplanting, of which 2 000 μmol􀅰L-1 NAC is the best. [ABSTRACT FROM AUTHOR]
Details
- Language :
- Chinese
- ISSN :
- 10002030
- Volume :
- 43
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Nanjing Agricultural University / Nanjuing Nongye Daxue Xuebao
- Publication Type :
- Academic Journal
- Accession number :
- 144776310
- Full Text :
- https://doi.org/10.7685/jnau.201908012