An effective and economic technology for fruit retention in mango (Mangifera indica L.) has been perfected and introduced to many mango growers at different locations of Sindh. During the year 2011 – 2012 this technology has covered area of 910 ha. in Sindh with an additional yield of 1020 Kg/ha and total impact of 46.4 m Rs respectively..
During gravel culture study, the V1DH, V3DH, V4DH, V5DH, V10DH, V13DH, V14DH, V15DH, V16DH, V19DH, V20DH, Sarsabz and LU-26s showed better tolerance to salinity at 12 dS/m NaCl.
The genotypes V2DH, V6DH, V7DH, V8DH, V9DH, V11DH, V12DH, V17DH and V18DH were found sensitive to high salinity stress.
In field conditions at 12 dS m-1 salinity, the genotypes categorized as tolerant (V1-DH, V4-DH, V5-DH, V6-DH, V8-DH, V9-DH, V12-DH, V13-DH, V15-DH, V16-DH, V18-DH, V20-DH, Sarsabz and Lu-26s) on the basis of < 50% reduction in 6-7 variables viz. plant height, productive tillers, spike length, spiklets/spike, no. of grain/spike, grain wt./spike and grain yield/plant. The genotypes (V8-DH, V13-DH and V19-DH) were found sensitive on the basis of > 50% reduction in 4-5 v
Studies conducted at germination and early seedling indicated that at the early stage, specific ion effect rather than osmotic effect was found prime cause of salt injury.
On tbe basis of growth and yield parameters, the genotypes (UPL-46, UPL-19, IR-8-154/N, UPL-79, UPL-74, Sarsahar 1513/H, UPL-29, UPL-28, Shua-92 205/H, RST-183, Shua-92 2561/H, IR-8- 202/E, RST-189 and UPL 21) were identified as water stress (aerobic condition) tolerant. Stress tolerance potential among UPL and LOL types have revealed that UPL types have comparatively more yield potential for water stress tolerance. The genotypes IR-8-202/E, IR-8-154/N, Shua-92 205/H and Shua-92 2561/H (LOL types)
Differential responses under water and salinity stress were observed in upland and lowland rice.
Osmotic potential in leaves decreased more in lowland rice than upland rice under saline condition.
LOL types have exhibited comparatively low concentration of sodium in their shoot
Germination (%) under osmotic stress (PEG-6000)
15 Mutants > 50% at 0.5 & 0.75 MPa
6 Mutants < 50% at 0.5 & 0.75 MPa
M-28, M-29, M-37 > 50% at 1.0 MPa
Khirman & Chakwal-86 (Check varieties) 83%
Wheat mutants showed significantly higher grain yield/plant (g) i.e. M-27 (18.31), M-28
(20.21), M-29 (21.19), M-31 (19.27), M-35 (18.42),
M-37 (19.15) and M-38 (17.82).
Out of 21 wheat mutants, 15 exhibited less reduction in growth (20%) over control under terminal drought in all yield and yield contributing components.
Four medium tolerant and two sensitive to water stress were identified.
Proline content increased > 17 folds in tolerant 15 mutants.
The maximum concentration of potassium (3.96, 3.93 & 3.92%) was found in variety Khirman & mutants M-26 & M-27, respectively. The minimum concentration (2.41%) was observed in mutant M-40 under water stress
Less reduction in total chlorophyll and lower osmotic potential was observed in tolerant mutants under drought conditions
Enhanced germination of wheat cultivars with GA-10-6 alone and in combination GA-10-6 + NAA-10-5 (>60%) was observed under saline field conditions (9.20 – 15.98 dS/m).
Comparison on the basis of growth responses revealed that GA-10-6 and GA-10-6 + NAA-10-5 M enhanced the number of tiller and spike length in wheat varieties under saline conditions.
An increase of 62% (SKD-I) and 42% (Bhittai) was observed with GA-10-6 + NAA-10-5 in grain yield when compared to their non-treated ones.