Photosynthetic leaf area modulates tiller bud outgrowth in sorghum
Abstract
Abstract Shoot branches or tillers develop from axillary buds. The dormancy versus outgrowth fates of buds depends on genetic, environmental and hormonal signals. Defoliation inhibits bud outgrowth indicating the role of leaf‐derived metabolic factors such as sucrose in bud outgrowth. In this study, the sensitivity of bud outgrowth to selective defoliation was investigated. At 6 d after planting (6 DAP ), the first two leaves of sorghum were fully expanded and the third was partially emerged. Therefore, the leaves were selectively defoliated at 6 DAP and the length of the bud in the first leaf axil was measured at 8 DAP . Bud outgrowth was inhibited by defoliation of only 2 cm from the tip of the second leaf blade. The expression of dormancy and sucrose‐starvation marker genes was up‐regulated and cell cycle and sucrose‐inducible genes was down‐regulated during the first 24 h post‐defoliation of the second leaf. At 48 h, the expression of these genes was similar to controls as the defoliated plant recovers. Our results demonstrate that small changes in photosynthetic leaf area affect the propensity of tiller buds for outgrowth. Therefore, variation in leaf area and photosynthetic activity should be included when integrating sucrose into models of shoot branching.
- Authors:
-
- Department of Biochemistry and Biophysics Texas A&,M University College Station TX 77843 USA
- Publication Date:
- Research Org.:
- Univ. of Southern California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1345708
- Alternate Identifier(s):
- OSTI ID: 1345709; OSTI ID: 1454852
- Grant/Contract Number:
- DE‐SC0009885; SC0009885
- Resource Type:
- Published Article
- Journal Name:
- Plant, Cell and Environment
- Additional Journal Information:
- Journal Name: Plant, Cell and Environment Journal Volume: 38 Journal Issue: 8; Journal ID: ISSN 0140-7791
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; axillary bud; defoliation; dormancy; shoot branching; sucrose; tillering; apical dominance
Citation Formats
KEBROM, TESFAMICHAEL H., and MULLET, JOHN E. Photosynthetic leaf area modulates tiller bud outgrowth in sorghum. United Kingdom: N. p., 2015.
Web. doi:10.1111/pce.12500.
KEBROM, TESFAMICHAEL H., & MULLET, JOHN E. Photosynthetic leaf area modulates tiller bud outgrowth in sorghum. United Kingdom. https://doi.org/10.1111/pce.12500
KEBROM, TESFAMICHAEL H., and MULLET, JOHN E. Sat .
"Photosynthetic leaf area modulates tiller bud outgrowth in sorghum". United Kingdom. https://doi.org/10.1111/pce.12500.
@article{osti_1345708,
title = {Photosynthetic leaf area modulates tiller bud outgrowth in sorghum},
author = {KEBROM, TESFAMICHAEL H. and MULLET, JOHN E.},
abstractNote = {Abstract Shoot branches or tillers develop from axillary buds. The dormancy versus outgrowth fates of buds depends on genetic, environmental and hormonal signals. Defoliation inhibits bud outgrowth indicating the role of leaf‐derived metabolic factors such as sucrose in bud outgrowth. In this study, the sensitivity of bud outgrowth to selective defoliation was investigated. At 6 d after planting (6 DAP ), the first two leaves of sorghum were fully expanded and the third was partially emerged. Therefore, the leaves were selectively defoliated at 6 DAP and the length of the bud in the first leaf axil was measured at 8 DAP . Bud outgrowth was inhibited by defoliation of only 2 cm from the tip of the second leaf blade. The expression of dormancy and sucrose‐starvation marker genes was up‐regulated and cell cycle and sucrose‐inducible genes was down‐regulated during the first 24 h post‐defoliation of the second leaf. At 48 h, the expression of these genes was similar to controls as the defoliated plant recovers. Our results demonstrate that small changes in photosynthetic leaf area affect the propensity of tiller buds for outgrowth. Therefore, variation in leaf area and photosynthetic activity should be included when integrating sucrose into models of shoot branching.},
doi = {10.1111/pce.12500},
journal = {Plant, Cell and Environment},
number = 8,
volume = 38,
place = {United Kingdom},
year = {Sat Feb 14 00:00:00 EST 2015},
month = {Sat Feb 14 00:00:00 EST 2015}
}
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Figures / Tables:
Figure 1: Axillary bud development in sorghum. (a) sorghum plant at 9 d after planting (9 DAP) with four leaves. Leaves are numbered according to their age, leaf number 1 the oldest. The red box at the base shows the location of the shoot apical meristem and axillary buds. (b)more »
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