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Morphological changes during juvenile-to-adult phase transition in sorghum.
Shumpei Hashimoto1, Takahiro Tezuka1,2, Shuji Yokoi3,4
1Laboratory of Plant Breeding, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
Planta
|July 31, 2019
Summary
Sorghum plants transition from juvenile to adult phases during the fourth and fifth leaf stages, marked by distinct morphological and genetic changes. This finding offers new insights into sorghum
Area of Science:
- Plant biology
- Developmental biology
- Agricultural science
Background:
- The juvenile-to-adult (JA) phase transition is crucial for plant growth and reproduction.
- Studies on JA transition in Poaceae crops like rice and maize are limited.
- Understanding this transition in sorghum is vital for crop improvement.
Purpose of the Study:
- To investigate the timing and characteristics of the juvenile-to-adult phase transition in sorghum.
- To identify morphological and genetic markers associated with this transition.
- To compare sorghum's transition timing with other plant species.
Main Methods:
- Analysis of morphological changes in sorghum shoot architecture, including leaf size, shape, and trichome development.
- Examination of the shoot apical meristem size.
- Quantification of microRNA (miR156 and miR172) expression levels during early development.
Main Results:
- Significant changes in leaf morphology (length/width ratio, trichome presence) were observed between the fourth/fifth and earlier/later leaf stages.
- miR156 expression decreased, while miR172 expression increased, correlating with leaf stage progression.
- Sorghum's juvenile phase spans the second to third leaves, with transition occurring during the fourth and fifth leaves.
Conclusions:
- The juvenile-to-adult phase transition in sorghum occurs during the fourth and fifth leaf stages.
- Distinct morphological and microRNA expression patterns serve as markers for this transition in sorghum.
- These findings contribute to a deeper understanding of sorghum's early developmental processes.
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