[Show abstract][Hide abstract] ABSTRACT: Allele frequency changes resulting from conventionalrecurrent selection were monitored at 34 SSR locidistributed across all 7 linkage groups using full-sibprogenies (50 each) from released pearl millet openpollinatedvariety CO (Cu) 9 and its four immediateprogenitor populations (ICMP 87750, ICMP 91751,ICMP 93752 and UCC 23). Agronomic performance ofthese 250 full-sibs was assessed in two seasons ofreplicated field trials at ICRISAT, Patancheru, India,which demonstrated significant selection responses forflowering time and grain, stover and biomass yields, andtheir components. These selection responses wereaccompanied by significant, but non-linear, frequencychanges for common alleles at many monitored SSR loci.Substantial genetic variability remains within CO (Cu) 9,suggesting further selection to improve its grain andstover yield performance should be effective.
[Show abstract][Hide abstract] ABSTRACT: HHB 67, released in 1990 by CCS Haryana Agricultural University, is one such single-cross pearl millet hybrid. HHB 67 is highly popular because of its extra-early maturity (it needs less than 65 days from sowing to grain maturity) and is now grown on over 500?000 ha in Haryana and Rajasthan, India. Recent surveys have indicated that this hybrid is starting to succumb to downy mildew (DM; caused by the pseudo-fungus Sclerospora graminicola), showing up to 30% incidence in farmers' fields. By rapidly adopting hybrid "HHB 67 Improved", farmers in Haryana and Rajasthan can avoid grain production losses of Rs36 crores (US$8 million) which would be expected in the first year of a major DM outbreak on the original HHB 67.
[Show abstract][Hide abstract] ABSTRACT: Twenty-eight inbred lines of pearl millet (Pennisetum glaucum) obtained from ICRISAT, Patancheru, Andhra Pradesh, India, were evaluated for salt tolerance under laboratory conditions. Seeds were germinated on filter papers on Hoagland's solutions containing 0, 75, 100 or 150 mM NaCl. Fifteen seeds were germinated in each culture tube and the seedlings were allowed to grow for 10 days in the same nutrient solutions. The genotype x salinity interaction was significant for shoot and root lengths. Tift 23D2B1-P1-P5, ICMB 841-P3, P310-17-Bk, ICML 22 and ICMB 95333 were highly tolerant of salinity. Fifteen lines were moderately tolerant and 7 lines were sensitive. Large differences in germination salinity tolerance were detected between members of several pearl millet mapping population parental line pairs (including Tift 23D2B1 and WSIL-P8, ICMB 841-P3 and 863B-P2, and P310-17-Bk and W-504-1-P1 at 150 mM NaCl, and ICMP 451-P8 and 81B-P6, LGD 1-B-10 and ICMP 85417-P7, and PT 732B-P2 and P1449-2-P1 at 100 mM NaCl). Differences between mapping population parental line pairs were also detected for salinity tolerance of early seedling growth.