Water relations and leaf gas exchange properties in some elite canola (Brassica napus) lines under salt stress

Abstract

In order to examine whether growth of eight genetically diverse canola (Brassica napus) lines under salt stress is positively associated with their rate of photosynthesis and other gas exchange related attributes, 20-day old plants of all eight lines were subjected to salinised soil containing 2.4 dS m -1 NaCl (control), 4 dS m -1 NaCl, 8 dS m -1 NaCl or 12 dS m -1 NaCl. The lines DGL (non canola) and Dunkeld were found to be salt tolerant and Rainbow and Cyclon salt sensitive with regard to shoot dry matter production and seed yield under saline conditions. In most of the lines there was a negative relationship between growth and net CO 2 assimilation rate. For example, the salt sensitive line Cyclon was the lowest and Con-III the highest, and the salt tolerant line Dunkeld intermediate in net CO 2 assimilation rate under salt stress. Stomatal conductance was found to be lower in the salt sensitive line Cyclon, followed by the salt tolerant line Dunkeld along with Oscar. Water use efficiency estimated as Pn/E was moderate in the salt sensitive line Cyclon and the salt tolerant line Dunkeld. In conclusion, high salt tolerance of Dunkeld and DGL (non-canola) was not positively associated with net CO 2 assimilation rate or Pn/E.

Assessment of Genetic Variations and Growth/Yield Performance of Some Egyptian and Yemeni Wheat Cultivars Under Saline Condition

“…Accumulation of solutes especially proline, glycine-betaine and sugars is a common observation under stress condition (Qasim et al, 2003). Ashraf et al (1990) revealed that proline is an important osmolyte to adjust the plant under drought/saline conditions.…”

Effect of Consortium of Plant Growth Promoting and Compost Inhabiting Bacteria on Physicochemical Changes and Defense Response of Maize in Fungus Infested Soil

“…Proline acts as antioxidant and scavenged reactive oxygen species (ROS). Proline, glycine betaine and sugars were solutes, accumulated in plant parts under stressed condition (Qasim et al, 2003). Proline concentration varies from 5% under normal condition to 80% under stressed condition in many plants (Szabados and Savoure, 2009).…”

TREATMENT STRENGTH OPTIMIZATION FOR MAIZE (Zea mays L.) AGAINST SALINE CONDITIONS USING BIPLOT ANALYSIS

“…Salt injury of plant leaves and stems is resultant of maximum inflow of Classociated with drop of K + uptake (Sharma, 1995). Accumulation of solutes especially proline, glycine-betaine and sugars is a common observation under stress condition (Qasim et al, 2003). Leaf proline content in salt stressed plants increased as observed in maize by Carpici et al (2010) and Moussa (2006).…”