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Nitrogen Dynamics and the Physiological Basis of Stay-Green in Sorghum

^a Hermitage Research Station, Dep. of Primary Industries, Warwick Queensland 4370, Australia
^b QDPI/CSIRO Agricultural Production Systems Research Unit, Toowoomba Queensland 4350, Australia

View larger version (25K): [in a new window]   Fig. 1 Relationship between aboveground N content at maturity and grain yield for nine sorghum hybrids grown under terminal water deficit (r = 0.83, n = 21, P < 0.001). Total N content was the sum of green leaf N content, dead leaf N content, stem N content, and panicle N content. In the case of AQL41/R69264, AQL41/RQL36, AQL41/RQL12 and A35/RQL12, at least one of these components was missing, preventing the calculation of total N uptake for those samples. Hence, there are only 21 points on the graph out of a potential of 27 points

View larger version (13K): [in a new window]   Fig. 2 Relationship between aboveground N content and green leaf area index at anthesis (r = 0.80, n = 23, P < 0.001), mid grain filling (r = 0.47, n = 25, P < 0.05), and maturity (r = 0.69, n = 21, P < 0.001) for nine sorghum hybrids grown under terminal water deficit. Total N content was the sum of green leaf N content, dead leaf N content, stem N content, and panicle N content. All graphs have less than 27 points, since at least one of these components was missing for a number of hybrids, preventing the calculation of total N uptake for those samples

View larger version (28K): [in a new window]   Fig. 3 Temporal pattern of N concentration during grain filling under terminal water deficit for the a) green leaf, b) dead leaf, c) stem, and d) panicle of three sorghum hybrids varying in the B35 source of stay-green in an RQL36 background. Vertical bars denote LSD (P = 0.05)

View larger version (30K): [in a new window]   Fig. 4 Temporal pattern of N content during grain filling under terminal water deficit for the a) green leaf, b) dead leaf, c) stem, and d) panicle of three sorghum hybrids varying in the B35 source of stay-green in an RQL36 background. Vertical bars denote LSD (P = 0.05)

View larger version (26K): [in a new window]   Fig. 5 Relationship between specific leaf nitrogen at anthesis and green leaf area at maturity for nine sorghum hybrids grown under terminal water deficit (r = 0.68, n = 24, P < 0.001). Total N content was the sum of green leaf N content, dead leaf N content, stem N content, and panicle N content. In the case of AQL39/RQL36, AQL39/RQL12, and AQL41/RQL12, one of these components was missing, preventing the calculation of SLN for those samples. Hence, there are only 24 points on the graph out of a potential of 27 points

View larger version (18K): [in a new window]   Fig. 6 Relationship between specific leaf nitrogen at anthesis and a) leaf nitrogen concentration at anthesis (r = 0.82, n = 24, P < 0.001), and b) specific leaf weight at anthesis (r = 0.62, n = 24, P < 0.62) for nine sorghum hybrids grown under terminal water deficit. Total N content was the sum of green leaf N content, dead leaf N content, stem N content, and panicle N content. Both graphs have less than 27 points, since at least one of these components was missing for a number of hybrids, preventing the calculation of SLN for those samples