Involvement of polyamines in cytoplasmic male sterility of stem mustard (Brassica juncea var. tsatsai) |
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Authors: | De-Ping Guo Yun-Zi Sun Zhu-Jun Chen |
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Institution: | (1) Institute of Molecular BioSciences, Massey University, Palmerston North, New Zealand |
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Abstract: | Changes in carbon isotope composition( 13C) and leaf morphology associated withvegetative phase change were monitored in Metrosiderosexcelsa Sol. ex Gaertn. (family Myrtaceae). Plants of threeontogenetic states were used: juvenile seedlings, micropropagated plants in arejuvenated state, and reproductively mature plants bearing leaves with adultcharacteristics. The effects of temperature regime (32/24 °C,24/16 °C, and 16/8 °C day/night) and plantarchitecture (branched and single-stemmed plants) were studied in two separateexperiments. Although both juvenile and rejuvenated plants exhibited juvenileleaf morphology at the start of the experiments, there was no differencebetweenleaf 13C in these plants and that in adultplantsat this time (mean ca. –27%). Vegetative phase change occurred injuvenileand rejuvenated plants grown at 24/16 °C, and there was acorresponding increase in leaf 13C (from ca.–27% to –23%) in these two groups of plants. Leaf 13C in adult plants remained relatively constant(ca. –26%) at 24/16 °C. There was little change in leaf 13C in all plant states maintained at 32/24°C or 16/8 °C, and vegetative phase change didnot occur in juvenile and rejuvenated plants grown under these two temperatureregimes. Rejuvenated plants grown in a greenhouse also exhibited a progressivedevelopment of adult leaf morphology, accompanied by an increase in leaf 13C, an effect that was more pronounced insingle-stemmed (from –26.4% to ca. –24%) than in branched plants. Itis suggested that increasing 13C in juvenile andrejuvenated plants undergoing phase change is a result of reduced sink strengthin single-stemmed plants, and to a lesser extent within each branch of branchedplants, causing reduced stomatal conductance and photosynthesis. |
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Keywords: | Image analysis Metrosideros excelsa Plant architecture Rejuvenation Source-sink relations |
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