Effects of different moisture regimes on oat (Avena sativa L.) biomass formation
2022
PlusaPluša, Lauma, Lauma | AlsinaAlsiņa, Ina, Ina | Zute, Sanita
Discussions on climate changes and its impact on cereal yields have become important in recent decades. Drought stress can affect oat yields to 70%; therefore during the selection it is important to develop varieties that are drought tolerant. In Latvian conditions no studies have been performed on the effect of water content on the growth and development of oat genotypes and biochemical changes in oats. The aim of this study was to determinate changes in biomass of oat genotypes depending on the amount of water and evaluates the resistance in drought conditions by determining the content of soluble carbohydrates. Oat biomass differs between moisture regimes and growth stages. The average oat biomass at flag leaf opening (BBCH 39) was 17.7 g in M1 regime, and 75.4 g in M4, but in watery ripe (BBCH 71) biomass ranged from 23.5 (M1) to 87.8 g (M4). Biomass formation was significantly affected (p is less than 0.05) affected by moisture regimes and variety. The highest soluble carbohydrates content (at BBCH 39) was in moisture regime M1, which was 27.6 °Brix, however, 13.3 °Brix was in moisture regime M4. And there was a correlation between soluble carbohydrates and plant biomass (r=0.92, n=28). Soluble carbohydrates decreased with the increase of biomass, changes in the amount of soluble carbohydrates in 86% of cases can be explained by the change in biomass values.
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