Hameed, Mansoor , Riaz, Atif , Ashraf, Muhammad , Naz, Nargis .
Leaf anatomical adaptations in Cynodon dactylon (L.) Pers. from the Salt Range (Pakistan) to salinity stress.
Leaf anatomical modifications were examined in a naturally adapted salt tolerant population of Cynodon dactylon (L.) Pers., collected from a heavily salt affected soil in the vicinity of a natural salt lake, Uchhali Lake, in the Salt Range of the Punjab province of Pakistan. An ecotype of this grass was also collected from a normal non-saline habitat from the Faisalabad region, which was considered as a control. Both populations were subjected to salt stress in hydroponics. The salt treatments used were: control (no salt), 50, 100, 150 and 200 mM of NaCl in Hoagland’s nutrient solution. After eight weeks of growth in hydroponics leaf and leaf-sheath anatomical characteristics in the differently adapted ecotypes were studied. The ecotype from the Salt Range was much better adapted to salt stress than its counterpart from the Faisalabad region. Anatomical adaptations in the salt tolerant ecotype to saline environments were very specific, and these were not only for the excretion of toxic ions but also accumulation of ions in the parenchymatous tissue. The most prominent adaptive feature in the salt tolerant ecotype was increased development of vesicular hairs for the exclusion of toxic ions through leaves as well as less affected parenchymatous tissue (mesophyll, bundle sheath, and bulliform cells) due to salt stress. Additionally, some adaptations reflected were the development of xeromorphic characteristics (decreased stomatal area and size on adaxial leaf surface, less affected epidermis, increased bundle sheath, and increased bulliform cell area) essential for checking undue water loss. Highly developed dermal tissue, particularly lower epidermis and bulliform cells, and decreased stomatal density and area in the salt tolerant ecotype seemed to be crucial for checking undue water loss under critical limited moisture environments.
Log in to add this item to your schedule
1 - University of Agriculture, Faisalabad, Department of Botany, Department of Botany, University of Agriculture, Faisalabad, Faisalabad, Punjab, Pakistan
2 - University of Agriculture, Horiculture, Institute of Horti. Sci., Faisalabad, 38000, Pakistan
3 - UAF, Botany
Presentation Type: Oral Paper:Papers for Topics
Location: 555A/Convention Center
Date: Wednesday, August 4th, 2010
Time: 2:15 PM