收稿日期: 2014-05-06
修回日期: 2014-06-20
网络出版日期: 2015-03-10
基金资助
公益性行业农业科研专项(201303022)
Preliminary Study on Mechanisms of Growth Promotion in Rice Colonized by Piriformospora indica
Received date: 2014-05-06
Revised date: 2014-06-20
Online published: 2015-03-10
印度梨形孢(Piriformospora indica)是一种能与植物建立互惠共生关系的根部内生真菌,能促进植物生长,增加作物产量。为了研究印度梨形孢对水稻生长发育的影响,将印度梨形孢与籼稻苗共培养后,分析印度梨形孢对水稻植株高度、生物量、分蘖数、抽穗期、穗粒性状、叶绿素含量、硝酸还原酶活性、根系活力以及生长相关调控基因表达水平的影响。结果显示,接种印度梨形孢的水稻株高、地上部干鲜质量、分蘖数、硝酸还原酶活性和根系活力显著高于对照;与对照相比,印度梨形孢定殖的水稻植株抽穗期提前4~6 d;印度梨形孢处理第3、4周后,叶片叶绿素含量比对照分别增加了19.77%和17.89%。RT-PCR分析表明,印度梨形孢定殖的水稻植株叶片中生长素相关调控基因OsIAA13和YUCCA的上调表达,表达量分别为对照的1.49倍和1.30倍;负调控水稻生长的NRR基因表达量为对照的58%。印度梨形孢促进水稻地上部的生长与叶绿素含量、硝酸还原酶活性、根系活力和生长相关调控基因的表达有关,印度梨形孢可能通过提高光合速率、增强水稻对矿质营养的吸收与利用和诱导生长素的分泌,促进水稻地上部的生长。
吴金丹, 陈乾, 刘晓曦, 林福呈, 高其康, 楼兵干 . 印度梨形孢对水稻的促生作用及其机理的初探[J]. 中国水稻科学, 2015 , 29(2) : 200 -207 . DOI: 10.3969/j.issn.1001-7216.2015.02.012
Piriformospora indica is a root endophytic fungus, which is able to establish beneficial symbiotic relationships with plant, and it can promote the growth of plants, enhance crop yield. In order to study the impact of P. indica on growth and development of rice, We analyzed the differences in plant height, biomass, tillering, heading, panicle properties, chlorophyll content, nitrate reductase (NR) activity, root activity and expression of growth-related genes between nonglutinous rice colonized and un-colonized by P. indica. The results showed that the plant height, biomass of shoot, the number of tillers, root activity and NR activity of rice colonized by P. indica were significantly higher than that in un-colonized ones. Rice colonized by P. indica headed 4-6 days earlier than the un-colonized rice. The contents of chlorophyll increased by 19.77% and 17.89% respectively after P. indica treatment for 3 and 4 weeks. RT-PCR analysis showed that the expression of auxin-regulated genes OsIAA13 and YUCCA were up-regulated in leaves of rice colonized by P. indica, being 1.49 and 1.30 folds as high as that of control plants. The expression of NRR, which negatively regulates the growth of rice, was 58% as high as that of control plants. The results indicated that the growth promotion of rice conferred by P. indica was relevant to chlorophyll content, NR activity, root activity and expression of growth-related genes. P. indica may promote the growth of rice through improving photosynthetic rate, enhancing mineral nutrition absorption and utilization and inducing auxin secretion.
Key words： Piriformospora indica; rice; chlorophyll; nitrate reductase; root activity; auxin
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