Multiple gene control of plastome-genome incompatibility and plastid DNA inheritance in interspecific hybrids of Zantedeschia |
| |
Authors: | J-L Yao D Cohen |
| |
Institution: | (1) Horticulture and Food Research Institute of New Zealand, Private Bag 92169, Auckland, New Zealand Fax: +64-9-815 4201 e-mail: jyao@hort.cri.nz, NZ |
| |
Abstract: | From interspecific hybridisation in the genus Zantedeschia, we have previously produced albino, variegated and virescent hybrids. The inhibition of chloroplast development in these
hybrids is due to plastome-genome incompatibility. The albino hybrids did not develop prolamellar bodies in their etioplasts
in darkness and formed only distended membranes, but no grana in light. This indicates that the block to chloroplast development
occurs before or during the development of etioplasts. In albino leaf sectors of variegated hybrids, chlorophyll and carotenoid
contents were only 2–4% of those in green plants. The mRNA levels for five plastid-development-related genes were also severely
reduced, but they were still readily detectable using Northern hybridisation techniques. In the green sectors of variegated
hybrids, chlorophyll content and mRNA levels of the fives genes were slightly reduced. We have earlier shown that F1 hybrids between Z. aethiopica and Z. odorata were albino when Z. odorata plastids were present but virescent when Z. aethiopica plastids were present. When the F1 hybrids with Z. aethiopica plastids were backcrossed to Z.
odorata, the progeny were albino, virescent or green. Z. odorata plastids were inherited only from maternal parents in the F1 progenies but inherited from either maternal or paternal parents in the backcross. The increased compatibility with, and
inheritance of Z. odorata plastids in the backcross suggests that multiple genes play a major role in the plastome-genome incompatibility. An increase
in the number of genes from the parent contributing the plastids improves chloroplast development in the hybrids of the genus
Zantedeschia.
Received: 29 November 1999 / Accepted: 2 December 1999 |
| |
Keywords: | Chloroplast development Plastid DNA inheritance Plastome-genome incompatibility Zantedeschia |
本文献已被 SpringerLink 等数据库收录! |
|