TY - JOUR
T1 - Effects of light regime on δ13C, photosynthesis and yield of field-grown banana (Musa sp., Musaceae)
AU - Israeli, Y.
AU - Schwartz, A.
AU - Plaut, Z.
AU - Yakir, D.
PY - 1996
Y1 - 1996
N2 - Banana plants (Musa sp., Musaceae) were grown for 2 years in the field in 12×20 in plots under irradiance levels incident upon the canopy of 100, 81, 62 and 32% of sunlight Time-integrated parameters such as leaf 13C, yield and leaf mass to area ratio were linearly correlated with irradiance level (R2>0.9). In contrast, midday CO2 assimilation and transpiration efficiency (A/g) decreased significantly and substomatal CO2 concentrations (cst) increased significantly only at the lowest irradiance levels (below 81% irradiance). Diurnal gas exchange measurements indicated that the linear response of the long-term parameters may be associated with the significant variations in photosynthetic activity among the irradiance treatments observed only in the early morning hours. The linear fit between yield and irradiance level (per cent of control) had a slope of 0.82 (with apparently constant yield to biomass ratio). These results directly demonstrate the significance of variations in incident light, such as may be associated with increasing cloudiness, on productivity of tropical plants such as the banana. The importance of using time-integrated indicators in general, and the reliability of using 13C discrimination in particular, in evaluating the responses of plants to changes in incident irradiance is demonstrated.
AB - Banana plants (Musa sp., Musaceae) were grown for 2 years in the field in 12×20 in plots under irradiance levels incident upon the canopy of 100, 81, 62 and 32% of sunlight Time-integrated parameters such as leaf 13C, yield and leaf mass to area ratio were linearly correlated with irradiance level (R2>0.9). In contrast, midday CO2 assimilation and transpiration efficiency (A/g) decreased significantly and substomatal CO2 concentrations (cst) increased significantly only at the lowest irradiance levels (below 81% irradiance). Diurnal gas exchange measurements indicated that the linear response of the long-term parameters may be associated with the significant variations in photosynthetic activity among the irradiance treatments observed only in the early morning hours. The linear fit between yield and irradiance level (per cent of control) had a slope of 0.82 (with apparently constant yield to biomass ratio). These results directly demonstrate the significance of variations in incident light, such as may be associated with increasing cloudiness, on productivity of tropical plants such as the banana. The importance of using time-integrated indicators in general, and the reliability of using 13C discrimination in particular, in evaluating the responses of plants to changes in incident irradiance is demonstrated.
KW - Banana
KW - Carbon-13
KW - Cloudiness
KW - Gas exchange
KW - Irradiance
KW - Isotopic discrimination
KW - Musa
KW - Musaceae
KW - Photosynthesis
KW - Shade
KW - Water use efficiency
UR - http://www.scopus.com/inward/record.url?scp=0030056184&partnerID=8YFLogxK
U2 - 10.1111/j.1365-3040.1996.tb00244.x
DO - 10.1111/j.1365-3040.1996.tb00244.x
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AN - SCOPUS:0030056184
SN - 0140-7791
VL - 19
SP - 225
EP - 230
JO - Plant, Cell and Environment
JF - Plant, Cell and Environment
IS - 2
ER -