TY - JOUR
T1 - Impact of dormancy regulating chemicals on salinity induced dormancy in Lasiurus scindicus and Panicum turgidum
T2 - Two desert glycophytic grasses
AU - El-Keblawy, Ali
AU - Al-Ansari, Fatima
AU - Al-Shamsi, Naeema
PY - 2010
Y1 - 2010
N2 - The indigenous forage grasses Lasiurus scindicus and Panicum turgidum are candidate species for the restoration of degraded desert rangelands. The impact of five dormancy regulating chemicals on overcoming salinity-induced germination inhibition was assessed under the best germination conditions in the two species. Seeds were germinated in a series of NaCl concentrations: 0-200 mM NaCl for P. turgidum, and 0-300 mM NaCl for L. scindicus. Lasiurus scindicus seeds were more tolerant to salinity than those of P. turgidum. Twenty percent of P. turgidum seeds germinated in 100 mM NaCl and none in the higher levels, but 47.5% and 8.8% of L. scindicus seeds germinated in 100 and 200 mM NaCl, respectively. The five studied chemicals (fusicoccin, GA3, kinetin, nitrate and thiourea) did not succeed in improving germination of non-saline treated seeds of the two species, compared to the control, except thiourea in P. turgidum. The salinity-induced germination inhibition in P. turgidum was completely alleviated by the application of gibberellic acid (GA3), partially alleviated by the application of fusicoccin, kinetin and thiourea, but not affected by nitrate. In L. scindicus, the germination inhibition was completely alleviated by fusicoccin, GA3, nitrate and thiourea, but partially alleviated by kinetin. For using the two grass species in restoration of degraded rangelands affected by higher salinity, the results suggest using fusicoccin, GA3, nitrate and thiourea with L. scindicus and GA3 with P. turgidum seeds as a preseeding treatment can overcome the problem of reduced germination.
AB - The indigenous forage grasses Lasiurus scindicus and Panicum turgidum are candidate species for the restoration of degraded desert rangelands. The impact of five dormancy regulating chemicals on overcoming salinity-induced germination inhibition was assessed under the best germination conditions in the two species. Seeds were germinated in a series of NaCl concentrations: 0-200 mM NaCl for P. turgidum, and 0-300 mM NaCl for L. scindicus. Lasiurus scindicus seeds were more tolerant to salinity than those of P. turgidum. Twenty percent of P. turgidum seeds germinated in 100 mM NaCl and none in the higher levels, but 47.5% and 8.8% of L. scindicus seeds germinated in 100 and 200 mM NaCl, respectively. The five studied chemicals (fusicoccin, GA3, kinetin, nitrate and thiourea) did not succeed in improving germination of non-saline treated seeds of the two species, compared to the control, except thiourea in P. turgidum. The salinity-induced germination inhibition in P. turgidum was completely alleviated by the application of gibberellic acid (GA3), partially alleviated by the application of fusicoccin, kinetin and thiourea, but not affected by nitrate. In L. scindicus, the germination inhibition was completely alleviated by fusicoccin, GA3, nitrate and thiourea, but partially alleviated by kinetin. For using the two grass species in restoration of degraded rangelands affected by higher salinity, the results suggest using fusicoccin, GA3, nitrate and thiourea with L. scindicus and GA3 with P. turgidum seeds as a preseeding treatment can overcome the problem of reduced germination.
KW - Desert grasses
KW - Glycophytes
KW - Salinity induced dormancy
UR - http://www.scopus.com/inward/record.url?scp=77957331876&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957331876&partnerID=8YFLogxK
U2 - 10.1007/s10725-010-9501-x
DO - 10.1007/s10725-010-9501-x
M3 - Article
AN - SCOPUS:77957331876
SN - 0167-6903
VL - 62
SP - 163
EP - 170
JO - Plant Growth Regulation
JF - Plant Growth Regulation
IS - 2
ER -