Evaluation of hydration indexes in kale leaves

Abstract

Hydration indexes are practical variables for quantifying plant water stress and can be useful for agronomic purposes. Three adapted hydration indexes based on relative water content, volumetric hydration, and leaf turgor pressure were evaluated in kale (Brassica oleracea var. acephala) leaf segments. Relative water content and volumetric hydration were measured in leaf segments after a water infiltration procedure with the aim of filling its large intercellular volumes (@18%v/v). The infiltration was done using a hydrostatic weighing procedure and with the aid of vacuum to fully hydrate the leaf segments. These two relative indexes were proportional to the transpiration-induced leaf water loss. The third index, turgor pressure, was measured with a Wiltmeter ® instrument. Similarly, the turgor pressure was proportional to the leaf water loss, and it decreased from @310kPa in recently harvested leaves to zero in dehydrated leaves, after a total water loss of @23%. Turgor pressure was correlated with the other two hydration indexes using approximations of leaf volumetric elastic modules. Similar estimates were obtained because the decline between turgor pressure and the natural logarithm of these relative leaf hydration indexes was numerically similar (@900kPa). However, the volumetric hydration index seemed to be more suitable as a model, not only for being more concise but also because it showed a clearer biomechanical representation of the leaf water deficit effects.

Determination of Optimization of Nutritional Deficiencies in Plant Physiology Practicum in Hydroponic Laboratories (Axis and No-Axis System)

“…The kale seeds used are Bangkok kale seeds LP-1 brand red arrow stamp. Equipment used in the study included: sprayer, pH meter, lux meter, hygrometer, analytical scales, TDS meter, plastic tub, small tray, jam bottle, reagent bottle, beaker glass, spatula, measuring pipette, pi-pump, drop pipette, measuring glass, measuring gourd (Calbo and Ferreira, 2011).…”

Selection of kale accesses to dehydration post-harvest by model identity test

“…Therefore, it is important to select genotypes that present less dehydration during storage. However, in the literature, there are few studies evaluating the dehydration of kale due to the accumulated loss of fresh matter (Calbo & Ferreira, 2011;Azevedo et al, 2016).…”