哈茨木霉对湿地松幼苗光合作用和生物量累积的影响

Effects of Trichodermaharzianum Infection on photosynthesis Rates and Biomass Accumulation of seedlings of pinus elliottii

摘要:

哈茨木霉(Trichodermahar之ianum)为有益的生防真菌 , 为 了更好地将其用于湿地松幼苗的培育 , 研究了 哈茨木 霉接种对湿地松(pinuselliottii)幼苗气体交换、叶绿素荧光以及生物量累积与分配 。试验结果表明 , 哈茨木霉接种可以显 著地增加湿地松幼苗的净光合速率和蒸腾速率 , 同时显著降低气孔导度和胞间二 氧化碳的浓度 。 哈茨木霉侵染显著降低 荧光参数Y(NO)而显著提高了其它几个荧光参数 , 如Y(II)、qL、ETR、qp和F℃/Fm。 哈茨木霉不仅显著增加了 湿地松幼 苗根系生物量、地上部分的生物量和总生物量而且显著增加生物量向根系的分配 。这些试验结果表明哈茨木霉可以用于 提高湿地松幼苗的质量。

Abstract:

Trichodermaharzianum is an endophytic fungus . In order to make use of the fungus in sylviculture of pinus elliottii seedlings , the effects of the endophyte on gas exchange , chlorophyll fluorescence , and biomass accumulation of pinus elliottii seedlings were studied. The results showed that the infection of the endophyte significantly increased net photosynthesis rate and transpiration rate , and significantly reduced stomatal conductance and intercellular Co2concentra- tion . The infection significantly reduced chlorophyll fluorescence parameter Y(NO) , and significantly increased other chlorophyll fluorescence parameters , such as Y(II) , qL, ETR, qp, and Fv/Fm. In addition , the infection significantly increased biomass accumulation of shoot , root and total biomass , and significantly changed the biomass allocation between shoots and roots of seedlings infected by the endophyte . In a word , Trichodermaharzianum could be used to improve the seedling quality of pinus elliottii.