6533b7d5fe1ef96bd1265123
RESEARCH PRODUCT
Seasonal dynamics of photosynthesis and total carbon gain in bearing and nonbearing pistachio (Pistacia vera L.) shoots
M. La MantiaGiulia MarinoGiulia MarinoTiziano CarusoFrancesco Marrasubject
0106 biological sciencesPhysiologyPlant SciencePhotosynthetic efficiencyPhotosynthesis01 natural sciencesBotanyRespirationmedicinePistaciabiologyPhenologyfungifood and beveragesPlant physiology04 agricultural and veterinary sciencesSeasonalitybiology.organism_classificationmedicine.diseaseSettore AGR/03 - Arboricoltura Generale E Coltivazioni ArboreeHorticultureShoot040103 agronomy & agriculture0401 agriculture forestry and fisheriesalternate bearing bud drop carbohydrates light-response curve photosynthetic photon flux density010606 plant biology & botanydescription
Seasonal changes in leaf gas exchange, assimilation response to light and leaf area were monitored in bearing and nonbearing pistachio shoots. Shoot bearing status did not directly affect leaf photosynthetic rate. However, photosynthetic light-response curves strongly varied during the season demonstrating the dominant effect of the treeâs seasonal phenology on assimilation. Early in the season low photosynthetic rates were associated with high rates of dark respiration indicating limited photosynthesis in the young leaves. As leaves matured, dark respiration decreased and assimilation reached maximum values. Photosynthetic efficiency was strongly reduced late in the season due to leaf age and senescence. Fruit load precipitated an early leaf senescence and drop that resulted in a 53% decrease in leaf area in bearing vs. nonbearing shoots, strongly decreasing the seasonal photosynthetic performance of bearing shoots. Bearing shoots produced a 26% lower seasonal carbon gain compared to nonbearing shoots.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-08-01 |