Morphological, physiological, and agronomic traits of crossings of 'Icatu' x 'Catimor' coffee tree subjected to water deficit

Abstract

The objective of this work was to select genotypes of Coffea arabica with good yield and potential tolerance to water deficit, as well as to try to understand the physiological and anatomical mechanisms involved in the adaptability of these genotypes to water stress. The physiological, anatomical, and agronomic traits of 19 genotypes of C. arabica were evaluated under the two following water conditions: regular irrigation and no irrigation (soil water deficit). The 'IPR 100', 2, 5, and 7 genotypes showed agronomic, physiological, and anatomical traits that contributed to a better water status maintenance in the initial development of coffee plants. Based on these results, these genotypes are potentially tolerant to water deficit. The 4, 10, 11, 14, 15, and 'Bourbon Amarelo IAC J10' genotypes show a lower adaptability of the anatomical structures under soil-water deficit conditions. The coffee tree genotypes display leaf plasticity, such as the thickness of palisade and spongy parenchyma, and the number, position, dimensions, and mobility of stomata under water deficit conditions.

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress

“…For example, they will increase the underground biomass and root distribution space to promote the absorption of more water and fertilizer, thus meeting the requirements for their physiological metabolic activities (Hura et al, 2022). Moreover, they will change the thickness of the leaf palisade and spongy tissues, as well as the number and size of the stomata (Coelho et al, 2022), and will transmit stress signals to promote the synthesis and secretion of proteins with antioxidant enzyme activities to maintain the stability of the plant cell structure (Liu et al, 2022). Therefore, breeding drought-tolerant rootstocks is of great importance to alleviate the decline in the yield and quality of passion fruit caused by drought and other unfavorable conditions.…”