scholarly journals TAA1-Mediated Auxin Biosynthesis Is Essential for Hormone Crosstalk and Plant Development

Cell ◽  
2008 ◽  
Vol 133 (1) ◽  
pp. 177-191 ◽  
Author(s):  
Anna N. Stepanova ◽  
Joyce Robertson-Hoyt ◽  
Jeonga Yun ◽  
Larissa M. Benavente ◽  
De-Yu Xie ◽  
...  
Keyword(s):  
Plant Development ◽  
Auxin Biosynthesis ◽  
Hormone Crosstalk

Early Establishment of Photosynthesis and Auxin Biosynthesis Plays a Key Role in Early Biomass Heterosis in Brassica napus (Canola) Hybrids

2020 ◽  
Vol 61 (6) ◽  
pp. 1134-1143
Author(s):  
Anyu Zhu ◽  
Aihua Wang ◽  
You Zhang ◽  
Elizabeth S Dennis ◽  
W James Peacock ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Plant Development ◽  
Seedling Establishment ◽  
Hybrid Vigor ◽  
Auxin Biosynthesis ◽  
Expression Of Genes ◽  
Early Expression ◽  
Early Seedling ◽  
Palisade Cells ◽  
Early Establishment

Abstract Heterosis or hybrid vigor has been used widely for more than a decade in Canola (Brassica napus) production. Canola hybrids show heterosis in a variety of traits compared to parents, including increased biomass at the early stages of seedling establishment, which is a critical developmental step that impacts future plant growth and seed yield. In this study, we examined transcriptomes of two parental lines, Garnet (Gar) and NX0052 (0052), and their reciprocal hybrids, Gar/0052, at 4 and 8 days after sowing (DAS). In hybrids, early seedling biomass heterosis is correlated with earlier expression of genes in photosynthesis pathways relative to parents. The hybrids also showed early expression of genes in the auxin biosynthesis pathway, consistent with the higher auxin concentrations detected in hybrid seedlings at 4 DAS. Auxin is a key phytohormone that regulates plant development promoting cell expansion and cell proliferation. Consistent with the increased levels of auxin, hybrids have larger and more palisade cells than the parents at the same time point. We propose a possible mechanism of early biomass heterosis through the early establishment of photosynthesis and auxin biosynthesis, providing insights into how transcriptional changes in hybrids are translated into phenotypical heterosis. This finding could be utilized in future Canola breeding to identify hybrid combinations with the superior early seedling establishment and strong levels of hybrid vigor in later plant development.

scholarly journals The Roles of Auxin Biosynthesis YUCCA Gene Family in Plants

2019 ◽  
Vol 20 (24) ◽  
pp. 6343 ◽  
Author(s):  
Xu Cao ◽  
Honglei Yang ◽  
Chunqiong Shang ◽  
Sang Ma ◽  
Li Liu ◽  
...  
Keyword(s):  
Gene Family ◽  
Plant Development ◽  
Normal Growth ◽  
Molecular Structures ◽  
Auxin Biosynthesis ◽  
Auxin Signaling ◽  
Oxidative Decarboxylation ◽  
Auxin Signaling Pathway ◽  
Dynamic Expression ◽  
Environmental Responses

Auxin plays essential roles in plant normal growth and development. The auxin signaling pathway relies on the auxin gradient within tissues and cells, which is facilitated by both local auxin biosynthesis and polar auxin transport (PAT). The TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA)/YUCCA (YUC) pathway is the most important and well-characterized pathway that plants deploy to produce auxin. YUCs function as flavin-containing monooxygenases (FMO) catalyzing the rate-limiting irreversible oxidative decarboxylation of indole-3-pyruvate acid (IPyA) to form indole-3-acetic acid (IAA). The spatiotemporal dynamic expression of different YUC gene members finely tunes the local auxin biosynthesis in plants, which contributes to plant development as well as environmental responses. In this review, the recent advances in the identification, evolution, molecular structures, and functions in plant development and stress response regarding the YUC gene family are addressed.

scholarly journals Local Auxin Biosynthesis Is a Key Regulator of Plant Development

2018 ◽  
Vol 47 (3) ◽  
pp. 306-318.e5 ◽  
Author(s):  
Javier Brumos ◽  
Linda M. Robles ◽  
Jeonga Yun ◽  
Thien C. Vu ◽  
Savannah Jackson ◽  
...  
Keyword(s):  
Plant Development ◽  
Auxin Biosynthesis
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