摘要
以不同倍性的甜瓜属二倍体种间杂种F_1、异源三倍体和异源四倍体为试材,比较了三者间光合特性和超微结构的差异。结果表明:与种间杂种F_1相比,异源四倍体的净光合速率(P_n)、气孔导度(G_s)、蒸腾速率(T_r)、PSⅡ电子传递量子效率(φPSⅡ)和光化学猝灭系数(qP)显著升高,并且叶绿体、线粒体、基粒和片层的数目也显著增多,表现出明显的基因组剂量效应。异源三倍体的P_n、G_s、ΦPAⅡ及线粒体和片层数目显著高于异源四倍体,表现出明显的杂种优势。
Three germplasms with different ploidies from interspecific hybridization in Cucumis were investigated for the photosynthetic characteristics and ultrastructure difference caused by genome dosage.The results showed that net photosynthesis rate（P_n）, stomatal conductance（G_s）,transpiration rate（T_r）,quantum efficiency of PSⅡphotochemistry（ΦPSⅡ） and photochemical quenching（qP） in allotetraploid increased obviously compared to interspecific hybrid F_1.In addition,the number of chloroplast, mitochondria,granule and lamella also increased significantly,which indicated genome dosage effects.Meanwhile,allotriploid had evident heterosis in P_n,G_s,ΦPSⅡ,the number of mitochondria and lamella.These results will be helpful for further investigation of the genome dosage effect in Cucumis.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2010年第1期32-36,共5页
Journal of Nanjing Agricultural University
基金
国家自然科学基金项目(30470120
30671419
30700541)
国家高技术研究发展计划专项(2006AA100108
2006AA10Z108)
关键词
甜瓜属
异源多倍体
光合特性
超微结构
基因组剂量
Cucumis
allopolyploid
photosynthetic characteristics
ultrastructure
genome dosage
