Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

Ciência e Agrotecnologia

Emanuelle Ferreira Melo²  Christiane Noronha Fernandes-brum¹  Fabrício José Pereira¹  Evaristo Mauro De Castro¹  Antonio Chalfun-júnior¹ 

[1] ,Empresa de Pesquisa Agropecuária de Minas Gerais Unidade Regional Epamig Norte de Minas Nova Porteirinha MG

关键词: Coffee tree;    ecophysiology;    water stress;    nitrate reductase;    Cafeeiro;    ecofisiologia;    estresse hídrico;    redutase do nitrato;   

DOI  :  10.1590/S1413-70542014000100003

来源: SciELO

【 摘 要 】

Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards. Re-irrigation promoted a partial recovery of the plant water potential. Non-irrigated plants showed an increase in stomatal resistance and reduction of transpiration and nitrate reductase activity. In the roots, there was a decrease in nitrate reductase activity under water stress. Leaf anatomical modifications were significant only for the adaxial surface epidermis and palisade parenchyma thickness, this latter characteristic being higher in control plants. Stomatal density and polar and equatorial diameter ratios showed the highest values in plants under water stress. In the roots, differences only in the cortex thickness being bigger in the non-irrigated treatment could be observed. Therefore, Siriema coffee plants under water stress show physiological, biochemical and anatomical modifications that contribute to the tolerance of this genotype to these conditions.

【 授权许可】

CC BY   
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