Unveiling a novel gene inheritance model for peduncle length in moth bean (Vigna aconitifolia L.)

Abstract

Understanding the inheritance patterns of specific traits related to plant architecture is crucial for selecting appropriate breeding methods. Crosses were conducted between RMO-257 (short peduncle, female parent) and CZMO-18-4 (long peduncle, male parent), as well as between CZM-45 (short peduncle, female parent) and CZMO-20-2-2 (long peduncle, male parent) for peduncle length, an important trait for plant architecture. The results revealed that peduncle length follows a ratio of 2.82:1 and 3.28:1 in the respective crosses, indicating control by a major gene, with minor genes or environmental factors contributing to its continuous variation. Although peduncles are categorized as either long or short, the long peduncle phenotype ranges from 5 cm to 15 cm, suggesting the involvement of multiple factors influencing the dominant gene. The short peduncle trait was found to be recessive. Non-significant χ2 values further confirmed that the observed results adhered to Mendelian inheritance patterns. This pioneering study on moth bean provides novel insights into the genetic control of peduncle length, offering a foundation for the development of improved breeding approaches in this underutilized crop. The above elucidation is a first report on the genetic inheritance of peduncle length or any trait in the orphan legume moth bean.