Dependence : Dependence Of Inflorescence Development On Photoperiod And Allelic Variation

1663 Words Nov 26th, 2015 7 Pages
CHAPTER NO.:- 05
Dependence of Inflorescence Development on Photoperiod and Allelic variation at
Ppd-H1 in Barley
DEEPANKSHA ARORA
DEPARTMENT OF BIOTECHNOLOGY
I.I.T. ROORKEE, ROORKEE
ABSTRACT
Since yield of temperate cereals (like Barley) is strongly affected by timing of floral transition and inflorescence development, therefore day lengths and the photoperiod response gene
PHOTOPERIOD1 (Ppd-H1) have reproducible effects on development in spring barley and introgressive lines. Differential gene expression and qRT-PCR of leaves and main shoot apices
(MSA) of barley confirmed the same. Day length is important in two phases of growth, floret primordia initiation (for both long and short day plants) and successful inflorescence development (which occurred for only long day plants). The transcripts associated with floral transitions are largely independently regulated of photoperiod and protein Ppd-H1. While those associated with inflorescence development and flower fertility were regulated by photoperiod and Ppd-H1 through induction of barley FLOWERING LOCUS T orthologs: FT1 in leaves and FT2 in
MSA. FT1 expression is co-regulated with transcripts involved in nutrient transport, carbohydrate metabolism and cell cycle regulation, suggesting its role in source-sink relationship. Successful inflorescence development is associated with FT2 upregulation along with upregulation of transcripts related to floral organ development, phytohormones and cell cycle regulators.
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