RESPONSES OF JOJOBA SEEDLiNGS TO DIFFERENT LEVELS OF SALINITY AND SODIUM ADSORPTION RATIO : IMPLICATION OF FOLIAR PHOSPHORUS NUTRITION FOR SALT TOLERANCE | ||||
| Journal of Plant Production | ||||
| Article 15, Volume 30, Issue 2, February 2005, Page 1033-1054 PDF (316.42 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237149 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Sanaa I. Laz; Sohair E. Esmail; A. E. Aly | ||||
| Olive and Semiarid Zone Fruits Res. Dept., Horticulture Research Institute, ARC, Cairo, Egypt | ||||
| Abstract | ||||
| Pot experiments were conducted during 2002 and 2003 seasons to study the effect of irrigation water with three salinity levels, 4000 6000 and 8000 ppm with two levels of Sodium Adsorption Ratios (SAR) 6 & 12 and foliar sprays of phosphorus as H3P04 ; at the highest level of salinity and SAR 6& 12 on plant growth ,some physiological aspects, changes of chemical constituents of jojoba seedlings, as well as the effect on anatomical features of jojoba leaf, Also, the study aimed to determine the physiological mechanism of phosphorus as foliar application in reducing salt stress effects on jojoba seedlings . The obtained results could be summarized as follows: Increasing salt concentration ¡n irrigation water caused marked decrease ¡n growth parameters of both seasons, namely, stem length, number of leaves I plant, leaf area and assimilation area as w&l as dry weight of ‘eaves ,fresh and dry weight of stem and roots of jojoba seedlings. In contrast, fresh weight of leaves significantly increased, ¡t mainly due to an increase in tissue water content reflected in the ¡ncreasing fresh weight: dry weight ratio which can take as a good indicator of tissue succulence within plant. The result also indicated that treating the seedlings which growing under 8000 ppm and SAR 6 &12 by phosphorus foliar sprays apparently tended to minimize the adverse effect of salinity. No visual salt damage in vegetative growth during the two seasons, where the suniival percentage was 100% in all treated plants were observed. It seems that jojoba seedlings able to tolerate the salt concentrations of irrigation water up to 8000 ppm &though; vegetative growth was significantly reduced under that salinity treatment. Regarding the effect of salinity levels in irrigation water on physiological and chemical aspects, the obtained data showed that, leaf osmotic potential (LOP) ,Ieaf succulence grade (LSG) , total soluble sugars and proline content increased with increasing salinity levels, whereas, results in both seasons showed significant reduction in chlorophyll a , b and carotene content as well as N , P , K content in the leaves of jojoba seedlings compared with control in two seasons. Sodium and chloride were significantly accumulated in jojoba leaves in response to the increase in salinity levels of irrigation water. The amount of N and C1 uptake by jojoba plants appear to be the highest under the highest salinity level comparing with other treated salinity levels in (he two seasons. Phosphorus application significantly increased cNorophyll a, b and carotene, on the other hand P decreased total soluble sugars and proline content in leaves of biaba seedlings as compared with only irrigated with satine water. Concerning the effect of phosphorus sprays on minerals content of jojoba leaves, results showed that P treatment results in higher leaf N, P and K content of jojoba seedlings than their analogous without P spraying. Moreover, P application to plants results in a signficant reduction in Na and C1 concentration ¡n leaves of jojoba | ||||
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