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- Author or Editor: A.K. Singh x
Sweet cherries (cultivar—‘Lambert’) were kept in a controlled atmosphere (CA) consisting of 10.5 per cent CO2 and 2.5 per cent O2 at 1°C. The sample fruits were taken periodically during the treatment and also after termination of the CA treatment. The concentration of amino acids, tyrosine and α-amino butyric acid; organic acid, malic acid; and total sugars were determined on an ethanolic extract of the fruit pulp. The respiratory CO2 was measured for separate lots of 1.2 to 1.5 kg of fruit.
Fruit stored at higher CO2 concentration had a lower amount of tyrosine, higher amounts of α-amino butyric and malic acids than in fruits stored in the conventional refrigerator at 1°C. The respiratory rate was inhibited, and there was no significant effect on total sugar content.
Seed germination of four Litchi chinensis Sonn. cultivars (`Deshi', `Kasba', `Purbi', and `Early Bedana') was studied under various conditions, viz. in soil beds exposed to sunlight or in shade, in sand beds exposed to sunlight or in shade, and on moist filter paper. Among all, shaded, humid sand at 35 ± 2C gave the highest germination. Delaying sowing seeds after removal from the fruit significantly reduced germination. Litchi seeds held in polyethylene bags up to 4 days at 37 ± 2C at 90% relative humidity delayed loss of seed viability. Germination was improved by ethephon in `Deshi' and `Early Bedana', by IBA in `Deshi' and `Purbi', and by 100 mm GA3 in all litchi cultivars. Cultivars responded differently to growth regulators, with `Deshi' responding significantly better than `Purbi', `Kasba', or `Early Bedana'. These studies point to the recalcitrant nature of litchi seeds. Chemical names used: gibberellic acid (GA3); indole butyric acid (IBA); 2-chloroethylphosphonic acid (ethephon).