TY - JOUR
T1 - Different pathways are involved in the enhancement of photosynthetic rate by sodium bisulfite and benzyladenine, a case study with strawberry (Fragaria x Ananassa Duch) plants
AU - Guo, Y.P.
AU - Peng, Y.
AU - Lin, M.L.
AU - Guo, D.P.
AU - Hu, M.J.
AU - Shen, Y.K.
AU - Li, D.Y.
AU - Zheng, S.J.
N1 - 08-3125
PY - 2006
Y1 - 2006
N2 - In order to understand the pathway involved in the chemical enhancement of photosynthetic rate, sodium bisulfite (NaHSO3) and benzyladenine (BA), a growth regulator, were applied to strawberry plants. The influence of these compounds on gas exchange and millisecond delayed light emission (ms-DLE) was investigated using 2-month-old plants. Results showed the net photosynthetic rate (A) in leaves was promoted by both NaHSO3 and BA. Stomatal conductance (g) and transpiration rate (E) were significantly increased only by BA, while intercellular CO2 concentration (Ci) was significantly decreased by NaHSO3. The enhancement of A by NaHSO3 and BA was only a short-term effect, lasting approximately 5 days for NaHSO3 and 30 h for BA. Plants treated with NaHSO3, BA or NaHSO3 + BA, showed no significant fluctuations in carboxylation efficiency (CE), photorespiration (RP) or dark respiration (RD). These results suggest that the influences of NaHSO3 and BA on gas exchange particularly A, could be via different mechanisms: the enhancement of A by the application of low concentrations of NaHSO3 appears to be associated with increased cyclic electron flow, while BA enhancement of A is at least partially due to increased g and/or E.
AB - In order to understand the pathway involved in the chemical enhancement of photosynthetic rate, sodium bisulfite (NaHSO3) and benzyladenine (BA), a growth regulator, were applied to strawberry plants. The influence of these compounds on gas exchange and millisecond delayed light emission (ms-DLE) was investigated using 2-month-old plants. Results showed the net photosynthetic rate (A) in leaves was promoted by both NaHSO3 and BA. Stomatal conductance (g) and transpiration rate (E) were significantly increased only by BA, while intercellular CO2 concentration (Ci) was significantly decreased by NaHSO3. The enhancement of A by NaHSO3 and BA was only a short-term effect, lasting approximately 5 days for NaHSO3 and 30 h for BA. Plants treated with NaHSO3, BA or NaHSO3 + BA, showed no significant fluctuations in carboxylation efficiency (CE), photorespiration (RP) or dark respiration (RD). These results suggest that the influences of NaHSO3 and BA on gas exchange particularly A, could be via different mechanisms: the enhancement of A by the application of low concentrations of NaHSO3 appears to be associated with increased cyclic electron flow, while BA enhancement of A is at least partially due to increased g and/or E.
KW - cyclic electron-transport
KW - chlorophyll fluorescence
KW - isolated-chloroplasts
KW - delayed fluorescence
KW - gas-exchange
KW - photophosphorylation
KW - leaves
KW - sulfite
KW - nahso3
KW - light
U2 - 10.1007/s10725-005-4403-z
DO - 10.1007/s10725-005-4403-z
M3 - Article
SN - 0167-6903
VL - 48
SP - 65
EP - 72
JO - Plant Growth Regulation
JF - Plant Growth Regulation
IS - 1
ER -