
TY  - JOUR
A1  - Pietrini, F. 
A1  - Iannelli, M. A. 
A1  - Battistelli, A. 
A1  - Moscatello, S. 
A1  - Loreto, F. 
A1  - Massacci, A. 
T1  - Effects on photosynthesis, carbohydrate accumulation and regrowth induced by temperature increase in maize genotypes with different sensitivity to low temperature
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1999
VL  - 26
IS  - 4
SP  - 367
EP  - 373
KW  - Low temperature, maize, photosynthesis, carbohydrates, regrowth, rubisco.
UR  - https://doi.org/10.1071/PP98151 
N2  - Photosynthesis and carbohydrate accumulation in maize genotypes (Zea mays L.) VA-36 and A-619, ranked as possessing low and high sensitivity to low temperature, were studied in relation to regrowth after transfer from day/night temperatures of 16/12&#x02DA;C to 25/20&#x02DA;C. Plants were grown for 45 days at 25/20 or 16/12&#x02DA;C, or transferred after 45 days from 16/12&#x02DA;C to 25/20&#x02DA;C for 27 days. Photosynthesis of both genotypes after a 45-day growth at 16/12&#x02DA;C was lower than at 25/20&#x02DA;C. When the photosynthesis of plants at 16/12&#x02DA;C was measured at 25&#x02DA;C it was as high as the photosynthesis of plants at 25&#x02DA;C in VA-36, while it remained lower in A-619. A strong reduction of rubisco content was observed in the sensitive genotype and is suggested as the cause of photosynthesis limitation that was still observed after recovery at 25/20&#x02DA;C. After a 45-day growth at 16/12&#x02DA;C, a reduction of sucrose and, to a lesser extent, starch content was observed. Biomass accumulation was also reduced in both genotypes. Transfer from 16/12 to 25/20&#x02DA;C increased photosynthesis, partially restored sucrose but not starch content and induced a rapid regrowth in VA-36. Conversely, photosynthesis, carbohydrate content and regrowth remained low in A-619. It is suggested that for the two genotypes, regrowth is dependent on the integrity of the photosynthetic apparatus which contributes to sensitivity to low temperatures. 
ER  -

