Dynamics of abscission of reproductive structures in common bean access

Abstract

Genotypes from the Andean and Mesoamerican gene pool can present contrasting behavior for reproductive structures fixation. The subject of this study was to determine the dynamics associated with the abscission of reproductive structures for common bean accesses from Andean and Mesoamerican gene pools in protected cultivation conditions. The experiment was carried out in a greenhouse, using seven common bean accesses from Embrapa Arroz e Feijão and the experimental design consisted of a randomized complete block design. The evaluations made were based on the number of days to begin flowering, flowering period, number of emitted flowers per plant, number of flower buds, flowers and pods aborted per plant, total number of pods per plant and number of seeds per plant.Certain characteristics were considered to be highly significant, such as the amount of days to begin flowering, the flowering period, percentage of aborted pods and number of harvested pods. The Mesoamerican accesses that presented greater abortion also produced more flowers, which suggests that abortion of reproductive structures can be a natural adjustment of the plant. Andean accessions with shorter reproductive period showed greater pod abortion. The dynamics of flower and pod abscission in the common bean proved to be widely variable depending on the different gene pools and genotypes evaluated and due to growth habit.

Impact of planting dates on yield and pod quality traits of snap bean under short-temperate season climates

“…This is more evident with cultivar 'Purple Royalty' which significantly differs in un-marketable yields in 2016 and 2017. Orsi et al (2021) found variable flower and pod abscission dynamics in different gene pools and genotypes of common beans and recorded certain bean characteristic to be highly significant in their studies, such as the amount of days to begin flowering, the flowering period, percentage of aborted pods and number of harvested pods. This study did not show a consistent positive relationship between yields and pod quality with respect to different planting dates.…”

“…A significant difference was reported (Nemeskéri et al, 2018) in stomatal density on both leaf surfaces between the green-podded and yellow-podded snap bean varieties, during flowering and pod development, under water deficiency and concluded that under non-irrigated conditions, stomatal resistance measured during flowering had a large effect on the individual pod yield. Orsi et al (2021) reported variable flower and pod abscission dynamics in different gene pools and genotypes of common beans. Vega, Chapman & Hall (2001), reported that changes to the management of planting season or cultivar always resulted in corresponding changes in pod and seed number.…”