紫外线辐射增加对大豆光合作用和生长的影响

EFFECTS OF ELEVATED ULTRAVIOLET RADIATION ON THE GROWTH AND PHOTOSYNTHESIS OF SOY BEAN

通过模拟南京地区自然光中有效紫外线Ｂ和紫外线Ａ辐射，增大辐射剂量对大豆光合作用，生长及生物量形成的影响迸行了研究。３个加强的ＵＶ辐射（０．１５，０．３５，０．７０Ｗ·ｍ－２）处理均使大豆植株矮化，抑制根、茎、叶的生长及干物质的积累。在３个ＵＶ处理中，生物效应以０．７０Ｗ·ｍ－２处理力最大，０．１５Ｗ·ｍ－２处理影响最小。ＵＶ辐射匀能使大豆叶片光合作用下降。下降幅度随ＵＶ辐射强度的增大而增大，本文还对ＵＶ影响大豆生长的可能机制进行了探讨。

Influences of elevated ultraviolet radiation(UV, broad band, 280-400 um) of thenatural solar ultraviolet radiation in Naming area on the growth, photosynthesis and development of biological yield of soy beau plants were investigated. The three levels of UV radiationintensity(0. 15, 0. 35, 0. 70, W. m-2) inhibited the growth of leaves, stems and roots, andreduced total biomass of soy beau plants. Soy beaus showed the largest biological response tothe UV radiation of 0. 70 W. m-2, while the least response was observed with treatment of0. 15 W. m-2 UV radiation. UV radiation significantly decreased the net photosynthesis.Changes in photosynthetic capacity decreased with the increase in UV radiation. The possiblemechanism by which UV radiation affects soy beau plants was discussed.