Evaluation of gas exchanges and production of genotypes of maçã banana type cultivated in the semi-arid region of Bahia

Alessandre Gabriel Oliveira Ramos,Alessandro de Magalhães Arantes,Maria Geralda Vilela Rodrigues,Maurício Antônio Coelho Filho,Sérgio Luiz Rodrigues Donato

doi:10.1590/0100-29452018500

Abstract

Abstract The objective of this study was to evaluate gas exchange and production of Maçã bananas type, at different times of the year and the day in semi-arid environment. Seven genotypes genotypes were used: Maçã, Caipira, BRS Tropical, BRS Princesa, YB42-03, YB42-17 and YB42-47, arranged in a completely randomized experimental design with five replicates and four useful plants per plot. For the physiological characteristics, a factorial arrangement 7x7x2 was considered (seven genotypes, seven evaluation periods, two reading times, 8:00 a.m. and 2:00 p.m.). Photosynthetic rates, carboxylation efficiency, and instantaneous water use efficiency are higher at 8:00 a.m., due to meteorological conditions, while foliar temperature and transpiration are higher at 2:00 p.m., due to the elevation of air temperature and low humidity. Months with higher radiation and intermediate temperature provided higher rates of photosynthesis, higher efficiency of carboxylation and photochemistry of photosynthesis. In general, genotype YB42-47 was the most productive, with higher water use efficiency and photosynthesis rates.

Highlights

Banana (Musa spp.) is a millenarian and widely consumed fruit, originated in Southeast Asia, with indications of its cultivation from 8.000 B.C., and it is currently distributed in several tropical regions of the world (CARVALHO et al, 2011)
For all physiological characteristics evaluated in Maçã banana type, interactions between the periods and the evaluation times were verified (Tables 1 and 2)
By the Scott-Knott criterion, Table 1 shows that there was formation of three groups for photosynthesis evaluated at 8 a.m

Summary

Introduction

Banana (Musa spp.) is a millenarian and widely consumed fruit, originated in Southeast Asia, with indications of its cultivation from 8.000 B.C., and it is currently distributed in several tropical regions of the world (CARVALHO et al, 2011). It has great economic importance and is well appreciated by the taste, easy consumption, good source of energy, vitamins and minerals, besides the low cost. The extreme susceptibility to Panana disease has made it unfeasible to cultivate in different producing regions

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