Abstract
Abstract This study aimed to quantify the effects of water management during hardening on seedlings of Gallesia integrifolia (Spreng.) Harms, evaluating leaf temperature, morphometric variables, and their performance after hardening in sandy and clayey soil. Water regimes included irrigation for four weeks (daily, every two, three, and four days). Leaf temperature was recorded at the end of each irrigation cycle. Increases in height, root collar diameter, root dry mass, and aerial part dry mass were measured at the end of the hardening period. The seedlings irrigated every two and three days did not significantly differ (p > 0.05) from those irrigated daily. Irrigation every four days reduced the speed of aboveground growth and increased leaf temperature. The seedlings irrigated every three and four days were more resistant to water deficit than those from other treatments, showing severe symptoms of water deficit later.
Highlights
AND OBJECTIVESGallesia integrifolia (Spreng.) Harms, popularly known as pau d’alho, occurs in all regions of the Brazilian Atlantic Forest, most frequently in the states of São Paulo and Paraná (Arunachalam et al, 2016)
This study aimed to quantify the effects of water management during hardening on seedlings of Gallesia integrifolia (Spreng.) Harms, evaluating leaf temperature, morphometric variables, and their performance after hardening in sandy and clayey soil
According to Saad et al (2009), the availability of water close to field capacity is greater in sandy soil than in clayey soil (Saad et al, 2009). These authors found that the survival time of seedlings of Eucalyptus urograndis under irrigation management during the hardening phase was shorter in clayey soil than in sandy soil (14 days for seedlings not tolerant to water deficit and 20 days for seedlings adapted to water deficit). They reported that in sandy soil, seedlings survived for 29 days regardless of the water acclimatization during hardening and that the water deficit symptoms appeared first in seedlings grown in clayey soil, mainly in those not adapted to water deficit
Summary
Gallesia integrifolia (Spreng.) Harms, popularly known as pau d’alho, occurs in all regions of the Brazilian Atlantic Forest, most frequently in the states of São Paulo and Paraná (Arunachalam et al, 2016). This species is recognized as having great medicinal importance (Bussmann & Glenn, 2010), the ability to be established in degraded areas, and attractiveness to fauna (Feijó et al, 2009). The growing demand for seedlings of native woody species in the last years shows the need to develop protocols that optimize their production at low cost and with morpho-physiological quality to meet the planting needs (Oliveira et al, 2016). Soil water scarcity causes the plants to develop strategies to minimize physiological needs, such as transpiration and photosynthesis, to survive with minimal water loss (Taiz et al, 2017)
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