Interaction effect between sodium and potassium on Rooting Responce of Mung bean cuttings

Abstract

Effect of sodium &Potassium chlorides and their interaction on rooting responce of fresh mung bean( Phaseolus aureus Roxb.)cuttings have been studied .Stem cuttings as an experimental system were taken from 10-day-old light grown seedlings under standard conditions (Continous illumination ,of irradiance of 1600-1800 lux ,temp of 25±1 Selezi and relative humidity (60-70)% The reselts revealed the followings 1-Potassium conc. was higher than sodium in all parts of the cutting .2-The optimal Conc.of sodium was (0.001M) ,which developed the highest rooting response ,with an increase equal to 38.4% .whereas , for potassium was ( 0.1M)and with an increase of 132%,compared to control .3-Equall rooting responces (12.2 roots)were developed at (0.001) M for NaCl & (0.00001M)for KCl (100:1 Ratio). Thereafter ,the response was increased with increasing KCl conc.until reaching the optimal conc.(0.1M) that stimulated the higher no.of adventitious roots (15.66) ,where the ratio become (1:100) .The latter represents the naturally occurring value of K+ in any plant tissue as many folds compared to Na+ (confirmed the value of point -l-.).4-The interaction between the optimal.of NaCl with different conc. of KCl,as well as, the optimal Conc. of KCl with different Conc. of NaCl was represented by the combination of (NaCl,0.001M+KCl,0.2M) and( KCl,0.1+NaCl,0.0001M)respectively ,that developed the heigher rooting response. 5-Spraying of NaCl to the primary leaves of seedlings during 5,6 and 7 days (before the cotyledons shrivels & dropping off spotaneously) which already supplied with KCl to their roots, increased the rooting response by 58.2%.Where as the response was reduced to 25% in case of the situation was reversed ,by spraying the KCl to primary leave. Discussion was focused on the Antagonistic role of Na+ against k+ whether supplied together, subsequently ,or to stock plants before taking the cuttings.