摘要
在4种光照处理条件下(处理Ⅰ:对所有分株光照处理;处理Ⅱ:对所有分株遮光处理;处理Ⅲ:仅对引入13CO2的复合节分株进行遮光处理;处理Ⅳ:仅对引入13CO2的复合节分株进行光照处理),分别从结缕草(Zoysia japonica Steud.)克隆植株的基部、中部和梢部(分别为第7、第17和第24复合节)分株引入13CO2,对13C在克隆植株不同器官内的分配格局及传输特征进行了研究。实验结果表明:从克隆植株的不同部位引入13CO2,13C的传输格局均表现出以引入点为起始点沿匍匐茎向基和向顶双向运输的趋势,但向顶传输的陡度值均小于向基传输的陡度值,向顶传输的距离则均大于向基传输的距离,说明13C的向顶传输更具优势。分株叶片、匍匐茎和复合节根中13C的传输格局有一定差异;引入点分株叶中δ13C值较高,其他分株叶中δ13C值均迅速降低;匍匐茎内δ13C值总体较低,但13C传输范围广;当13CO2引入点位于基部和中部时复合节根的δ13C值高于匍匐茎,但当13CO2引入点位于梢部时复合节根的δ13C值低于匍匐茎。从13C的传输范围及陡度值看,总体上分株叶中13C的陡度值显著大于复合节根和匍匐茎;在匍匐茎中13C呈现出平缓的传输格局但传输距离最远。此外,在4种光照处理条件下,处理Ⅳ的根及匍匐茎中13C向基或向顶传输的陡度值总体上均最高,且各器官13C的传输距离均最远;但从基部、中部和梢部分株引入13CO2后,分别在处理Ⅱ、处理Ⅲ和处理Ⅰ的分株叶中13C向基或向顶传输的陡度值均最高。根据实验结果,对不同光照条件下结缕草克隆植株不同器官内光合产物的分配格局及其生态效应进行了探讨。
Under four light treatment conditions ramets; treatment Ⅱ ： shading treatment to all （treatment I ： full light treatment to all multiple-node multiple-node ramets; treatment Ⅲ： shading treatment only to multiple-node ramets fed with 13CO2; treatment IV： full light treatment only to muhiple-node ramets fed with 13CO2）, 13CO2 was fed from the basal, middle and distal ramets （i. e. the seventh, the seventeenth and the twenty-fourth multiple-node ramets） of clonal plant of Zoysia japonica Steud., and 13C distribution pattern and translocation characteristics in different organs of clonal plant of Z. japonica were studied. The results show that after 13CO2 fed from different part ramets, ~3C translocation pattern all appears the trend of bidirectional transport toward basal and toward distal along the stolons taking fedramets as the starting point, but the transloeation gradient value toward distal all is lower than that of toward basal and the translocation distance toward distal is all bigger than that of toward basal, meaning the distal translocation of 13C has more advantage. There is a certain difference in translocation pattern of 13C in ramet leaf, stolon and multiple-node root. The δ13-C value in ramet leaf fed with 13CO2 is higher but that in other ramet leaves decreases sharply. The δ13-C value in stolon is generally lower but the 13C translocation range is extensive. The δ13C value in multiple-node root is higher than that in stolon when 13 CO2 is fed from the basal and middle ramet leaves, while that is lower than that in stolon when 13 CO2 is fed from the distal ramet leaves. From the translocation range and gradient value, generally, the 13C gradient value in ramet leaf is significantly higher than that in multiple-node root and stolon. And in stolon, 13C translocation appears a gentle pattern but its translocation distance is the farthest. Moreover, under four light treatment conditions, the gradient value of 13C translocation toward basal or distal directions in multiple-node root and stolon is the highest and the 13C translocation distance in all organs is the farthest in treatment IV. But the gradient value of 13C translocation toward basal or distal directions in ramet leaf is the highest respectively in treatment Ⅱ ,Ⅲ and I when 13CO2 is fed from the basal, middle and distal ramets. According to these experimental results, the distribution pattern of photosynthetic products and its ecological effect in different organs conditions are discussed. of elonal plant of Z. japonica under different light
出处
《植物资源与环境学报》
CAS
CSCD
北大核心
2013年第4期1-10,共10页
Journal of Plant Resources and Environment
基金
国家自然科学基金资助项目(31170387)
上海市闵行区科学技术委员会项目
华东师范大学211工程项目
关键词
结缕草
光照条件
生理整合格局
^13C同位素示踪
克隆植物
生态效应
Zoysia japonica Steud.
light condition
physiological integration pattern
13 C tracer
clonalplant
ecological effect
