Biochemical and physiological changes in conilon coffee (Coffea canephora) grown under different levels of irradiance

Abstract

Modern agriculture values the most sustainable and dynamic means of production, which can be promoted through the association between coffee and tree components, aiming at the best use of the land. However, within our understanding of the physiological and biochemical behaviors of the coffee tree, the irradiance limiting conditions are crucial to maximize the potential gains generated in these systems. In this sense, the objective of this study was to evaluate the effects of different levels of irradiance restriction on the physiological and biochemical characteristics of two genotypes of Conilon coffee. The experiment was conducted in a 2 × 3 factorial scheme, corresponding to two Conilon coffee clones and three levels of light intensity restriction (0, 30 and 50%), in a randomized block design with four replications. The synthesis of total chlorophyll b and the leaf N content of the genotypes CL6 and CL12 increased with the reduction of light. On the other hand, there was a reduction in the levels of carbohydrates, amino acids and phenols with the reduction of light intensity. Restricted levels of irradiance caused different changes in the physiological and biochemical characteristics of the studied genotypes, showing genetic divergences between them

Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants

“…Some cultural practices are capable of maximizing biomass growth and accumulation in cultivated plants, and the use of indole-3-acetic acid may be included (Ferreira et al, 2021a;Huan et al, 2021;Li et al, 2019a;Ribeiro et al, 2019;Yao et al, 2019). In general, the application of IAA in plants stimulates growth due to the induction of cell division and stretching (Blum, 2009;Zou et al, 2018).…”

“…In addition to the fact that these two species differ in appearance and origin, they also differ widely in the quality and flavor of the drink (Bagyaraj et al, 2015;Davis et al, 2011) Among the species of the Coffea genus, C. arabica L. presents an accentuated variation in vegetative growth and productive potential (Camargo, 2010), also known as coffee bienniality. Some factors have been attributed and studied to better understand this variation such as temperature, photoperiod, precipitation, competition for photoassimilates by fruits, hormonal balance in the plant, among others (Amaral et al, 2006;Barros et al, 1997;Ferreira et al, 2021a;Nazareno et al, 2003), but large gaps to solve this phenological event in coffee culture still remain.…”

Association of Altitude and Solar Radiation to Understand Coffee Quality

“…It is also noteworthy that although light is an essential resource for the plant, its intensity and durability can affect the patterns of biochemical and physiological responses of plants, with emphasis on the synthesis of secondary metabolites, chlorophyll, nitrogen allocation and cellular respiration [41][42][43][44]. These changes at biochemical and physiological levels associated with the plant's genetic response may have been decisive for the sensory quality of the coffee.…”