Network resilience of plant-bee interactions in the Eastern Afromontane Biodiversity Hotspot

Publication Type

Journal Article

Journal Name

Handbook of Photosynthesis, Fourth Edition

Publication Date

1-1-2024

Abstract

Common bean and tepary bean are legumes of high economic value grown by small farmers in conditions of acid soil and high temperature. These bean species have contrasting physiological behavior with specific mechanisms that are expressed when exposed to stress conditions, allowing them to achieve a greater level of adaptation. This chapter shows the main results related to the photosynthetic response of common bean breeding lines and tepary bean germplasm accessions that were grown under the combined stress conditions of acid soil and high temperature. We present evidence for the genotypic differences in photosynthetic mechanisms and the photosynthetic response of promising common bean and tepary bean genotypes. We identify a few photosynthetic traits that can contribute further to the improvement of common bean. Different photosynthetic response typologies were found whose adaptation mechanisms related to different variables such as the leaf temperature difference (LTD), which shows the cooling capacity of the leaf in relation to the ambient temperature. The change in LTD is associated with instantaneous water use (WUE), transpiration (E), and stomatal conductance (gs), which influence the rate of carbon fixation (A). Likewise, the maximum quantum efficiency of PSII photochemistry in dark-adapted leaves (Fv/Fm) and the quantum yield of photosystem II (Φ2) were the most important variables that allow separating the photosynthetic responses of different tepary bean accessions. These results on the photosynthetic response differences among common bean and tepary bean germplasm are expected to contribute toward improving the genetic diversity in the photosynthetic ability of common bean and tepary bean genotypes used in breeding programs that aim for genetic gain in common bean tolerance to the combined stress conditions of acid soil and high temperature.

ISBN

[9781040031650, 9781032280332]

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