چکیده:
To investigate the influence of salinity and calcium (Ca) on some properties of Plantago ovata, a pot factorial
experiment based on randomized complete block design with three replicates was conducted in Jiroft, south of Kerman
Province, Iran. Three salinity levels of 0, 100 and 200 mM NaCl and Ca levels of 0, 5 and 10 mM Calcium nitrate were
applied as the first and second factors, respectively. Results showed that salt levels significantly affected plant height, dry
weight, number of spikes per plant, spike length, number of seeds per spike, mucilage and 1000 seed weights. Maximum
values for the measured variables were obtained in control and the minimum values in 100 mmol sodium chloride. The
effect of Ca on these traits was significant as well; it diminished the adverse effects of salinity. In addition, the interactive
effects of salt and Ca on all the above traits were remarkable except for mucilage and spike length on which no significant
effect was observed.
خلاصه ماشینی:
"Shekofteh* Department of Soil Science, Faculty of Agriculture, Vali-e-Asr University, Rafsanjan, Iran Received: 27 December 2014; Received in revised form: 4 March 2015; Accepted: 16 March 2015 Abstract To investigate the influence of salinity and calcium (Ca) on some properties of Plantago ovata, a pot factorial experiment based on randomized complete block design with three replicates was conducted in Jiroft, south of Kerman Province, Iran.
During salinity stress, in addition to reduction in water absorption, accumulation of some ions at high concentration levels in plant tissues probably leads to toxicity or ionic imbalance.
Results from variance analysis showed that the effect of salinity stress on bush height was significant at 1% level (Table 2).
As Table 5 shows, a reduction in dry weight occurs due to an increase in salinity, which influences plant growth and yield by exerting osmotic pressures and ionic effects.
This study applied calcium with nitrate; the latter inhibits adverse effects of chloride and salinity and elevates plant growth and yield parameters.
No significance was observed regarding the interactive effects of salt stress and calcium on spike length (Table 2).
4. Conclusion The results of the present study indicate that maximum yield, yield components and mucilage increased under normal conditions without salinity and 15 mM calcium application and are at a minimum from severe salt stress under absence of calcium, indicating the pivotal role of Ca in improving plant tolerance to salinity stress.
At low salinity levels, all rates of calcium application increased vegetative growth and yield of the plant."