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  • Author or Editor: M. C. Chu x
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Abstract

Parameters of spur/pedicel abscission in the plum (Prunus domestica L. cv. Stanley) have been recorded throughout induction and development during the early stages of fruit growth. This study of abscission includes both young-persisting and ‘drop’ fruits, each having diverse abscission potentials. Gross morphology revealed irregularity of pattern and stain intensity in abscission development occurring between the spur and fruit pedicel. Anatomical study indicated an effect upon cells (as far as 20–50 in number away from the immediate abscission zone) in response to safranin and fast green stains.

Open Access
Authors: and

Abstract

Shoot proliferation of ‘Forever Yours’ greenhouse rose (Rosa hybrida L.) was a-chieved in vitro using a modified Murashige and Skoog (MS) high salt medium supplemented with 6-benzylamino purine (BA) at 2.0 mg/liter and naphthaleneacetic acid (NAA) at 0.1 mg/liter. Shoots were readily rooted on ¼ strength MS medium without hormones. Rooted shoots were successfully transferred to soil and grew well in the greenhouse.

Open Access

Abstract

Rapid proliferation of axillary buds of ‘Thornless Boysenberry’ and ‘Thornless Young-berry’ (Rubus sp.) in tissue culture has been achieved on a modified Murashige and Skoog (MS) medium containing 6-benzylamino purine (BA) and α-napthaleneacetic acid (NAA). Shoots were induced to root on medium consisting of MS high mineral salts, myo-inositol, and thia-mine·HCl diluted to 1/16 to 1/2 strength and supplemented with full strength sucrose and agar. Rooted plants have been successfully moved to soil and grown in the greenhouse.

Open Access

Abstract

Ethylene production of 470 ‘Hi-Early Red Delicious’ apples harvested from primary, secondary, tertiary, etc., branches of 4 uniform trees of Malus domestica Borkh. was measured to determine pattern of ripening in relation to fruit position on the tree. Considerable variation was noted between and within branches. Some fruits showed surprisingly high ethylene (about 200 ppm at 155 days and up to 500 ppm at 160 days after full bloom) while others measured less than 5 ppm. Regression analysis revealed a linear trend between primary branches from base to apex of the tree. Delayed ethylene production of fruits below terminal shoots suggests ripening regulators in shoot tissue are interacting to delay ethylene synthesis.

Open Access

Abstract

In vitro studies indicated that an isolated embryonic axis, or an intact embryo with all or part of its cotyledons, of a ‘Delicious’ apple (Malus Xdomestica Borkh.) produced only a single shoot and root. Adventitious shoot formation was observed when the embryonic axis was excised and the cotyledons were grown in vitro. The number of shoots formed increased as the length of the transverse cut surface was increased. More than 30 shoots per explant were obtained when both the proximal and distal one-third sections of the cotyledon (relative to the embryonic axis) were removed. An increase in shoot number per explant resulted in decreased shoot length. A polar phenomenon was observed in all excision treatments; adventitious shoot formation occurred only at the proximal cut end of the cotyledon.

Open Access