Diversity of photoperiodic responses in oats

I G Loskutov,E V Blinova,I A Kosareva,V A Koshkin,I I Matvienko

doi:10.18699/vj19.546

I G Loskutov, E V Blinova + Show 3 more

Open Access

https://doi.org/10.18699/vj19.546

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Abstract

The article presents the results of an evaluation of the earliness and photoperiodic response (PPR) in the long-day oat accessions of various geographic origin. The material for this study were 139 oat accessions from the global collection of plant genetic resources maintained by the Vavilov Institute (VIR), which included landraces, breeding cultivars, and lines. In addition, the donors of low sensitivity to photoperiod developed at VIR were tested. A preliminary field study of the oat collection for early maturity and growing plants in the vegetation experiment was carried out according to the VIR Guidelines. The early accessions from VIR’s oat collection identified in the field showed a great diversity of their photoperiodic responses during the vegetation experiment in a photoperiod facility. By origin, most of the accessions described in the vegetation experiment as earliness and weakly responsive to photoperiod were from Brazil (66 %); others from the USA, Portugal, Turkey, Colombia and Australia. Most of the Russian cultivars studied (77 %) were sensitive to a short photoperiod. Among donors with different photoperiodic responses, Skorospely 1 and Skorospely 2 were weakly responsive to photoperiod, while Srednespely 1 and Srednespely 2 showed medium responses. Many years of field studies and vegetation experiments with the oat genetic diversity from the VIR global collection have resulted in identifying genotypes characterized by earliness and weak photoperiodic responses. These accessions are of special value for breeders and currently being used to develop new early and productive oat cultivars.

Highlights

The most important factors affecting the duration of a plant’s growing season, especially its first half, are the daylight length and the temperature regime
Privet that served as the reference in the field experiment, but under short-day conditions in the photoperiod facility they showed considerable differences in their heading time
During the analysis of oat accessions for their photoperiodic responses in the vegetation experiment, the references showed the following results: the early Mexican cultivar Chihuahua in all years of study demonstrated a delay in heading under short day (SD) versus long day (LD) by 8.1 (5.8–9.3) days, and CPPR = 1.21 (1.17–1.26), while the late Turkish local cultivar Anatolisсher had a delay in heading by 35.8 (28.3–49.5) days and CPPR = 1.79 (1.61–2.23)

Summary

Introduction

The most important factors affecting the duration of a plant’s growing season, especially its first half, are the daylight length and the temperature regime. The flowering time is an important factor in oat’s adaptation to growth condi tions Genotypes differing in their responses to photoperiod and vernalization may prove useful when selecting parent pairs for the development of new cultivars, which would make use of the duration of the growing season with more efficiency (Locatelli et al, 2008). These factors may produce an effect on individual stages of plant development, especially on the durations of the periods between germination and booting and between germination and heading It should be taken into account when definite accessions are used as source material for breeding (Koshkin et al, 2003, 2009, 2013).

Materials and methods

Results

30 Photoperiod-insensitive

Conclusion