Ultrastructure of leaf chloroplasts and root tip plastids of two maize lines differing in chilling tolerance
1996
Ciamporova, M. | Trginova, I. (Slovenska Akademia Vied, Bratislava (Slovakia). Botanicky Ustav)
Low temperature effects on the structure of leaf chloroplasts and root tip plastids were investigated in the chill-sensitive Penjalinan and chill-tolerant Z7 maize lines. In the Penjalinan plants the size of the mesophyll chloroplasts with disorganized thylakoids increased, as did the number of plastoglobuli and the area of the membrane-free stroma. The only structural change induced by 6 deg C in mesophyll chloroplasts of the tolerant Z7 plants was the appearance of 1 to 2 starch grains in their stroma. Differences between the two lines in structural changes of root cell plastids were found. While in Penjalinan starch accumulation was induced by low temperature, an increased frequency of thylakoids and their dilation occurred in Z7 plastids. The more severe structural disturbances and the absence of starch grains in the Penjalinan leaf chloroplasts confirm relationships between chilling tolerance and membrane properties, respiration, photosynthetic, and assimilate transport activities reported by other authors. The differences in starch accumulation in the root cell plastids may correspond with stronger inhibition of root growth in the sensitive genotypes
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