Heteroblasty in Arabidopsis thaliana (L.) Heynh |
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Authors: | Hirokazu Tsukaya Keiko Shoda Gyung-Tae Kim Hirofumi Uchimiya |
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Affiliation: | (1) Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan, JP;(2) Advanced Science Research Center, Japan Atomic Energy Research Institute, Takasaki 370-12, Japan, JP |
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Abstract: | Heteroblasty in Arabidopsis thaliana was analyzed in a variety of plants with mutations in leaf morphology using a tissue-specific β-glucuronidase gene marker. Some mutants exhibited their mutant phenotypes specifically in foliage leaves. The phenotypes associated with the foliage-leaf-specific mutations were also found to be induced ectopically in cotyledons in the presence of the lec1 mutation. Moreover, the features of an emf1lec1 double mutant showed that cotyledons can be partially converted into carpelloids. When heteroblastic traits were examined in foliage leaves in the presence of certain mutations or natural deviations by histochemical analysis of the expression of the tissue-specific marker gene, it was found that ectopic expression of the developmental program for the first foliage leaves in lec1 cotyledons seemed to affect the heteroblastic features of the first set of foliage leaves, while foliage leaves beyond the third position appeared normal. Similarly, in wild-type plants, discrepancies in heteroblastic features, relative to standard features, of foliage leaves at early positions seemed to be eliminated in foliage leaves at later positions. These results suggest that heteroblasty in foliage leaves might be affected in part by the heteroblastic stage of the preceding foliage leaves but is finally controlled autonomously at each leaf position. Received: 9 July 1999 / Accepted: 17 August 1999 |
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Keywords: | : Arabidopsis (mutant lec1) – Cotyledon – Foliage leaf – Heteroblasty – Mutant (Arabidopsis) |
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