Effect of Ppd-A1 and Ppd-B1 Allelic Variants on Grain Number and Thousand Kernel Weight of Durum Wheat and Their Impact on Final Grain Yield

Frontiers in Plant Science
Jose M ArjonaDolors Villegas

Abstract

The main yield components in durum wheat are grain number per unit area (GN) and thousand kernel weight (TKW), both of which are affected by environmental conditions. The most critical developmental stage for their determination is flowering time, which partly depends on photoperiod sensitivity genes at Ppd-1 loci. Fifteen field experiments, involving 23 spring durum wheat genotypes containing all known allelic variants at the PHOTOPERIOD RESPONSE LOCUS (Ppd-A1 and Ppd-B1) were carried out at three sites at latitudes ranging from 41° to 27° N (Spain, Mexico-north, and Mexico-south, the latter in spring planting). Allele GS100 at Ppd-A1, which causes photoperiod insensitivity and results in early-flowering genotypes, tended to increase TKW and yield, albeit not substantially. Allele Ppd-B1a, also causing photoperiod insensitivity, did not affect flowering time or grain yield. Genotypes carrying the Ppd-B1b allele conferring photoperiod sensitivity had consistently higher GN, which did not translate into higher yield due to under-compensation in TKW. This increased GN was due to a greater number of grains spike-1 as a result of a higher number of spikelets spike-1. Daylength from double ridge to terminal spikelet stage was strong...Continue Reading

References

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Citations

Feb 23, 2020·Frontiers in Plant Science·Jessica SchmidtDelphine Fleury
Feb 18, 2020·Journal of Agronomy and Crop Science·Jose M ArjonaDolors Villegas
Mar 7, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Paul TelferHaydn Kuchel

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Methods Mentioned

BETA
dissection

Key Resources (RRID) Mentioned

SCR_008567
SCR_014242

Software Mentioned

JMP
SAS

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