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Modeling biomass allocation and grain yield in bread and durum wheat under abiotic stress
Dry matter (DM) partitioning into stems, leaves, and seed of two wheat (Triticum aestivum and T. durum) genotypes (A and D, respectively) in response to multiple abiotic stresses were quantified and their impact on kernel weight (KW, mg kernel**-1) and grain yield (GY, Mg ha**-1) was evaluated in a factorial experiment during two years of contrasting rainfall and temperature regimes. In addition to early (E) and late (L) planting, the population density was increased in each case by 25%, thus creating two extra stress levels (E+25, and L+25). Averaged over years, the stress levels, genotypes, and their interaction accounted for 68, 40, and 67% of variation in DM partitioned into stems, leaves, and seed, respectively; and for 75 and 37% of variation in KW and GY, respectively. DM partitioned into stems, leaves and seed was correlated (p<0.05) with KW (r= -0.35, -0.37 and 0.48, respectively), but not with GY, except for DM partitioned into leaves (r=-0.23, p<0.05). The AE and AE+25 partitioned the largest DM to leaves (16%), whereas DL+25 partitioned the least (7%). Largest and smallest DM partitioned into stems were those of AL (56%) and DL (28%), respectively, and largest and smallest DM partitioned into seed were those of AE+25 (54%) and AL (34%), respectively. The largest GY produced by AE+25 (4.59) and AE (3.98) was associated with intermediate KW (3.75 and 3.62, respectively); whereas the smallest GY produced by DL+25 (2.4) and DL (2.55) was associated with small KW (2.92 and 3.21, respectively). A stress-DM partitioning- GY or KW response model was developed for A and D, and can be used to develop selection indices for stress tolerance.
Jaradat, Abdullah A.
Triticum turgidum subsp. durum
dry matter accumulation
dry matter partitioning
Australian journal of crop science 2009 Sept., v. 3, no. 5
Journal Articles, USDA Authors, Peer-Reviewed
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