Variability in grain yield components of soybean sister lines under drought conditions

Abstract

Objective of this study was to investigate changes in soybean grain yield and its components as affected by drought conditions. During two year trial, 26 soybean lines from the same cross combination were tested. Average temperatures and total rainfall during the growing season were approximate in both years. The differences in the average monthly temperature and distribution of precipitation between years were of crucial importance, since they brought about changes in major yield components and grain yield per plant. In less favorable year 2012, drought period during seed filling was observed. The decrease in number of pods and number of seeds per plant, as well as in 1000 seeds weight was noted. In all sister lines included in trial, grain yield per plant was very significantly reduced in the year 2012, as compared to the year 2011.

Proučavane su promene prinosa zrna po biljci i njegovih komponenti pod uticajem suše. U toku dve godine u Zemun Polju je testirano 26 linija iz iste kombinacije ukrštanja. Prosečne temperature u toku vegetacije i ukupne količine padavina su bile približne u obe godine. Od presudnog značaja su bile razlike srednjih mesečnih temperatura i rasporeda padavina između godina, koje su uticale na promene vrednosti glavnih komponenti prinosa zrna i prinosa zrna po biljci. Uočen je sušni period u toku nalivanja zrna u manje povoljnoj 2012. godini, pri čemu je došlo do smanjenja broja mahuna i broja zrna po biljci kao i mase 1000 zrna. Prinos zrna po biljci, kao kompleksna osobina, se takođe značajno smanjio kod svih sestrinskih linija obuhvaćenih istraživanjem.