Water osmotic absorption in Coleus blumei plants under salinity stress

Brazilian Archives of Biology and Technology

José Ozinaldo Alves De Sena²  Humberto Actis Zaidan¹  Paulo Roberto De Camargo E Castro¹ 

[1] ,Universidade Estadual de Maringá Departamento de Agronomia Maringá PR ,Brasil

关键词: Water relations;    water potential;    transpiration;    stomatal resistance;   

DOI  :  10.1590/S1516-89132006000700001

来源: SciELO

【 摘 要 】

Three month old Coleus blumei plants in pots were treated with different NaCl concentrations: 0.00, 0.25, 0.50 and 1.00%. To determine the water osmotic absorption, the plants had their stems cut at 10 cm from the soil surface. The remaining stems were linked to glass tubes by flexible rubber tubes. Readings of the water column level in the glass tubes were performed at each 30 minutes, corresponding to the water osmotic absorption, with a total of eleven readings. Other Coleus blumei, with the same age, received the NaCl concentrations, and were evaluated under field conditions in terms of transpiration and stomatal resistance. A randomized complete block analysis was used with five replications. An increase of osmotic absorption was verified for all treatments up to three hours after application. Then a proportional reversion of osmotic absorption to the increases on saline concentration was observed, with a higher effect in the treatment with NaCl 1.00%, showing the increase of water loss by the roots. During this period time, the treatment showed a normal linear growth of the osmotic absorption. Transpiration was reduced proportionally to the increase of salinity concentration.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License