Effect of Foliar Spraying With 5- Aminolevulinic Acid and Different Types Amino Acids on Growth of Date Palm of Plantlets after Acclimatization in the Green House

Abstract

This study aimed to evaluation the effects of 5- aminolevulinic acid which is the precursor of chlorophyll, in addition to glutamine, asparagine, arginine, proline, tyrosine and tryptophan on the date palm plantlets (Phoenix dactylifera L.) which produced by tissue culture in the green house after acclimatization to increasing the growth parameters of this plantlets. Complete randomized block design was used. to conduct the experiment at three treatments 100,200 and 300mg/l with three replicates and control treatment (without spraying), these treatments was subjected as weekly spraying one time/week, all plantlets received 3g/l NPK with irrigation water one time/week, vegetative growth parameters of plantlets were estimated (plant height cm, leaves number/plantlet, stem thickness cm and fresh and dry weight of leaves (g), also chemical leaves contents as, Indoles, chlorophyll a and b, total amino acids and total sugars. Results showed the response of growth parameters increased with foliar application of all amino acids treatment, lowest mean value was found with tyrosine application, maximum response for growth parameters was observed at the level of 300 mg/l of all treatments of amino acids as compared to (control treatment) non-sprayed plants. Leaves contents of indoles mg/g f.w., chlorophyll a and b mg/g f.w., total amino acids mg/g d.w. and total sugars % were greater rising with spraying of different types of amino acids; the results showed that highest interaction was found between all types of amino acids with the concentration 300mg/l.So from results the application of 5- aminolevulinic acid and different types of amino acids was to be useful to promote growth of date palm plantlets in the greenhouse.