I am interesting in salinity resistance and Mandarins, does anybody know of any related research resources?
I have no experience of Citrus but i had conducted research on effect of salinity on growth and mineral nutrition of Zizyphus jajuba and Jaman (Eugenia Jambolana)
Thanks sir for ur nice reply.can i get ur papers of "effect of salinity on growth and mineral nutrition of Zizyphus jajuba" or Generally, in this topic"salinity". Sorry for my bad English language and late answer
Thanks for your message, You may search this paper in my publicaions List, I have uploaded it.
Dear Hany , your question is very interesting . Infact , citrus as a genus is considered susceptible to salinity , but still lot variation does exist amongst different species ,, especially at rootstock level . The salinity tolerance studies are largely dependent on the age of the experimental plants , limits of salinity concentration including the type of salinity , you are attempting ( whether chloride type, sulphate type or bicarbonate type etc ) , type of soil your experiment is in progress like texture will dictate the outcome finally etc etc... so many variables are brought , with the result , a plant species declared tolerant in your pot experiment , distinctly fails to display that salinity tolerance property when tested in field. Citrus is no exception . Since citrus is basically grown on different rootstocks , the tolerant rootstock , we can opt to have better success under saline soil conditions. Cleopatra mandarin , Rangpur limes using mandarins as scion have shown excellent salinity tolerance , but trifoliates , rough lemons , citranges etc are considered suscetibl to salinity . find below my one publication to use root cation exchange capacity as indicator of salinity tolerance at pre-evaluation stage .
Let me add some more responses ..
Summary ; Soil salinity significantly limits citrus production in many areas worldwide. Although data on fruit yieldsin response to salinity are limited, they indicate that grapefruit, lemons, and oranges are among the mostsensitive of all agricultural crops. Fruit yields decrease about 13% for each 1.0 dS m-’ increase in electrical conductivity of the saturated-soil extract (EC,) once soil salinity exceeds a threshold EC, of1.4 dS m-‘. Accumulation of excess Cl- and Na+ can cause specific ion toxicities, but this problem canbe minimized by selecting rootstocks that restrict the uptake of these ions. During the past two decades,numerous papers describing the agronomic and physiological responses of citrus to salinity have beenpublished. This paper reviews these research reports and discusses differences in the response of citrusspecies to salt stress, the role of different rootstocks, the causes of salt injury, and the interactions of otherenvironmental conditions or stresses with salinity.( Source : Maas , 1993, Tree Physiology 12, 195-2 I6).
Abstract: High correlations were found between juice and leaf chloride (Cl) contents in a wide range of citrus cultivars, which included lemon (Citrus limon L.), orange (Citrus sinensis L.), grapefruit (Citrus paradisi Macf.) and mandarins (Citrus reticulata, Citrus temple Hort ex Tan. and C. reticulata × C. paradisi) on different rootstocks, irrigated with different quality waters. Juice Cl analysis has proven to be a good tool for assessing the salinity response of diverse rootstocks and the effect of cultural practices on Cl uptake by the trees. Juice, rather than leaf analysis, has the advantages of providing a larger and more uniform sample, and preventing sample contamination by contact with saline irrigation water. Cl uptake and transport into the leaves and fruit of the scion was increased by trifoliate orange (Poncirus trifoliata L.) and ‘Troyer’ citrange (C. sinensis × P. trifoliata), even when irrigated with mildly saline water. Under high salinity, Cl accumulation in grapefruit and orange trees was low on Cleopatra mandarin (Citrus reshnii Hort ex Tan.) and sour orange (Citrus aurantium L.), while it was increased on rough lemon (Citrus jambhiri Lush.). ( Source ; Ranking the salt tolerance of citrus rootstocks by juice analysis,by Y. Levy, J. Shalhevet,doi:10.1016/0304-4238(90)90071-L)
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