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

Many fruit crops planted on calcareous soils suffer from iron insufficiency. Citrus plantations in the Mediterranean basin are frequently afflicted by high pH calcareous soils, which cause nutrient imbalances in the trees, which are exacerbated by iron deficiency. 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. The maximum chlorophyll concentration was found in 'Valencia' scions grafted onto 'Rangpur lime' and 'Antalya Cleopatra' mandarin rootstocks, while the lowest was found in 'Swingle' citrumelo. However, regardless of rootstock, the leaves of the 'Valencia' scion did not vary in terms of transpiration rate. Leaves of the 'Valencia' scion grafted on the '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 use efficiency.

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