Do Really Close Stomata by Soil Drying ABA Produced in the Roots and Transported in Transpiration Stream?

Abstract

Stomatal aperture responses of Commelina communis L. between well watered plants and water stressed plants were investigated. To see the very rapid response to water stress, the plants were directly rooted out from the soil and exposed to the air immediately. Stomata, rooted out from the soil, were totally closed within 10 minutes without any detention time while the stomata of the plants in the soil had been kept opening. These results suggest that stomatal response to the abrupt water stress is very rapid indicating that guard cell itself or leaves could sense water status in the plants.

Propuesta Metodológica Para Calendarizar El Riego en Invernadero Rustico Usando Un Índice De Estrés Térmico

“…Investigaciones similares señalan que durante periodos de estrés la fisiología del tomate tiene mecanismos para tomar agua de sus frutos para la evapotranspiración, en casos extremos, afectando de manera negativa la calidad de los mismos (De Swaef et al, 2012). En un día con periodos nublados (Figura 3B) el estrés de la planta disminuye, como se observa en el horario de las 14:00 horas, pues se ha estimado que el tiempo de respuesta fisiológica del tomate a la falta de agua es de aproximadamente 5 min (Lee, 2013). En octubre el IET g disminuye (Figura 3D); sin embargo, el cultivo está sometido a estrés por temperaturas bajas y altas afectando la maduración y calidad de los frutos, como ya se ha indicado en otras investigaciones (Liu et al, 2013;Kacjan Maršić et al, 2011;Lizarraga et al, 2003;).…”

The Electrophysiology Application on Guard Cells to See the Influence of Carbon Dioxide

“…After it have been reported that blue light modulates guard cell osmoregulation via its activation of proton pump via the stimulation of the synthesis of organic solutes, many papers about the candidates of blue light photoreceptors were published (Taiz and Zeiger, 2007;Bowling, 1992, 1993;Kim and Lee, 2007;Lee, 2010Lee, , 2013. The observation of light responses in epidermal strips (Kuiper, 1964;Hsiao et al, 1973;Ogawa et al, 1978) and in isolated guard cell protoplasts (Zeiger, 1983) provide evidence that stomatal responses to light can be separated from those to change in Ci (intercellular CO2 concentration).…”