EFFECTS OF SOME ROOTSTOCKS ON PHOTOSYNTHETIC PERFORMANCE OF YOUNG ‘VALENCIA’ ORANGE TREES IN CALCARE

Many fruit crops planted on calcareous soils suffer from iron insufficiency. High pH calcareous soils commonly impact citrus plantations in the Mediterranean region, resulting in tree nutritional imbalances exacerbated by iron shortage. The photosynthetic performance of 'Valencia' orange (Citrus sinensis Osb.) budded on five different rootstocks ('Carrizo' citrange, 'Swingle' citrumelo, 'Rangpur' lime, 'Antalya Cleopatra' mandarin, 'Tuzcu 31 31' sour orange) on calcareous soil was examined in this study. In 2011, the experiment was carried out on the Cukurova University Faculty of Agriculture Department of Horticulture's experimental plot. Leaf chlorophyll content, fluorescence parameters in light-adapted chlorophyll (QY: FV' /FM': Photosystem II quantum yield), and leaf gas exchange parameters were all measured. 'Valencia' scion that was grafted onto 'Rangpur' The mandarin rootstocks 'lime' and 'Antalya Cleopatra' had the maximum chlorophyll content, while 'Swingle' citrumelo had the lowest. However, regardless of rootstock, the transpiration rate of the leaves of the 'Valencia' scion remained constant. 'Valencia' scion leaves grafted on 'Swingle' citrumelo rootstock, on the other hand, showed a considerable drop in photosynthetic rate, stomatal conductance, and photosystem II quantum output. The leaves of the 'Valencia' scion grafted on sour orange had the maximum photosynthetic rate and leaf water usage efficiency.

Please see the link :- https://www.ikprress.org/index.php/JOGAE/article/view/351