Figure 8: Barley plants whose roots grew through layers of sand that were high(H)or low(L)in the particular nutrient. Controls had all nutrients at the h level Control Phosphate Nitrate 藻 HHH W H a LHL Ammonium Potassium H H
From Watt and Evans(1999) Plant Physiology 121: 317-323
From Watt and Evans (1999) Plant Physiology 121: 317-323
1.0 Proteoid root formers 0.8 0.6 0.4 0.2 ■ 0.0 From: Watt and Evans(1999)Plant Physiol. 121, 317-323
Proteoid - root formers From:Watt and Evans (1999) Plant Physiol. 121, 317-323
Investment of assimilates in roots is increased in response to nutrient deficiencies. This results in an increase in root shoot ratio Dry weight Root shoo treatment t ratio (mM) Shoot Root 0.05 0.8 0.45 0.56 0.5 3.5 1.39 0.40 5.0 9.2 1.82 0.20
N treatment (mM) Dry weight Root:shoo t ratio Shoot Root 0.05 0.8 0.45 0.56 0.5 3.5 1.39 0.40 5.0 9.2 1.82 0.20 Investment of assimilates in roots is increased in response to nutrient deficiencies. This results in an increase in root:shoot ratio
TABLE 3: Effect of P supply on root shoot ratios in different strains of beans Low P Adequate P Root Shoot Root Shoot dry wt dry wt Root: shoot dry wt dry wt Root: shoot Strain mg)(mg) ratio g)(mg)ratio 310872 035 26915040.18 113561141 031 18112330.15 6124777 0.16 24214650.17 9103719 0.14 14510960.13 From Gerloff (13)