Influence Of Growth Substances Research Articles

Induction of plants from anthers of Beta vulgaris cultured in vitro

The influence of growth substances, saccharose and yeast extract on the differentiation of monogerm sugar beet and polygerm fodder beet anthers is studied. Callus and roots were found to form on the anthers. After subculture, callus derived from a well determined combination of growth substances differentiated into buds, from which plantlets were obtained in unlimited numbers. After rooting, they were transfermed to the soil where they continued to grow. This suggests the possibility of an adaptation of this method in vegetative propagation of beets.

Influence of Growth Substances on Rooting Cuttings of Chrysanthemum

The purpose of this research was to stimulate the process of rizogenesis at cuttings of chrysanthemum treated with different stimulant solutions. Effectiveness of this treatment can lead to shortening the time from planting to harvesting flowers. Cuttings used from four cultivars of chrysanthemums, in order to stimulate the risogenesis process, were treated with NAA, 2,4-D, Thiamine, Alar, Procaine and Radi-Stim.
 Stages of experimental work complied with the protocol and were conducted in the Laboratory Research Plant belonging to the Vegetale Physiology discipline.

Rooting and establishment of Calabrian pine plantlets propagated in vitro: influence of growth substances, rooting medium and origin of explant

SUMMARYThe effect of auxins and a cytokinin on induction of roots in cultured axillary shoots of Pinus brutia Ten, has been tested. Auxin was crucial for root initiation and the rooting response varied according to the type and concentration of auxin applied. Both auxin and cytokinin and the interactions between them affected the quantity and quality of the induced roots. Aerated non‐sterile tap water was an effective rooting medium, comparable to agar. After planting out into soil, some of the influences of auxin and cytokinin could still be seen after six months. However, roots developed normally in the soil, displaying dichotomous lateral branches. The results draw attention to the need for care in the choice and application of the medium for the initial induction of roots. Results of greenhouse trials indicated that the most vigorous plants were obtained via the axillary shoots.

Gametophytic Plants induced from Single Cells of Moss Callus

CALLUS and callus-like tissues have been reported in a wide variety of plants. Steward et al.1 have described induced organization of intact plants from ‘aggregates’ which accumulated from single cells of carrot callus; Bristow2 has reported induction of discrete fern plants (sporophytic and gametophytic) from his callus cultures under influence of growth substances, and Bauer3,4 has shown that varied sporophytic and gametophytic forms may be induced from callus of moss. This communication deals with aberrant moss plants, gametophytic in form, regularly induced from single-cell callus plantings of Polytrichum commune Hedw.

The Influence of Growth Substances on the Formation of Shoots from Aspen Roots

The Influence of Growth Substances on the Formation of Shoots from Aspen Roots

Influence of Growth Substances on the Geotropic Response of Roots

Influence of Growth Substances on the Geotropic Response of Roots

EFFECTS OF ALPHA–NAPHTHALENEACETIC ACID AND ALPHA–NAPHTHALENEACETAMIDE ON THE DEVELOPMENT OF THE COTTON PLANT

DESPITE THE extensive literature on effects of growth substances on development of plants, there are very few reports on influences of growth substances on cotton plant. While there have been a number of attempts to reduce boll abscission by use of growth substances, these have not been successful and few of them have been reported in literature. Dunlap (1945) reported negative results when he used several growth substances including naphthaleneacetic acid, and Eaton and Rigler (1945) stated that the present information does not permit any well-defined application of observation or theory to relations between hormone activity and shedding of cotton bolls, but some of marked differences between cottons in extent to which shedding occurs would seem to preclude possibility that in all cases this shedding can be attributed solely to nutritional relations. Except for limited amount of work on growth substances in relation to boll shedding, there has apparently been no work done on influences of growth substances on cotton. Any adequate review of influence of growth substances on plant development in general would be unwieldy and unnecessary here, so further citations of literature will be restricted to papers pertinent to discussion which appears later in this paper. The present study was initiated primarily to investigate possible influence of growth substances on boll abscission, but other effects were also observed and measured. As experiment progressed it became apparent that a general study of effects of growth substances would be more valuable than a specific studv of abscission, especially since so little has been reported on effects of growth substances on development of cotton plant. The results show that a-naphthaleneacetic acid, and to a lesser degree a-naphthaleneacetamide, have definite effects on growth and development of cotton plant. In general, growth was inhibited rather than stimulated by treatments, and it is unlikely that any of effects are of interest from standpoint of agronomic application, either as regards boll abscission or otherwise. 1 Received for publication April 23, 1949. This paper is a complete revision and condensation by junior author of a thesis submitted by senior author (1948) in partial fulfillment of requirements for degree of master of science at A. and M. College of Texas. The authors wish to acknowledge with thanks suggestions made by Dr. A. A. Dunlap, checking of statistical analyses by Prof. C. B. Godbey, critical reading of this manuscript by Dr. Frank M. Eaton, and testing of cotton fibers by Mr. J. L. Watson. METHODS.-Several seeds of Stoneville 2B variety of cotton (Gossypium hirsutum L.) were planted in each of a number of 2-gal. glazed jars on February 28, 1948, and by March 6 plants had been thinned to one per jar. The plants were maintained in fertile soil under good greenhouse cultural conditions throughout experiment, and

Influence of Growth Substances on Growth and Cell Division in Green Algae

Influence of Growth Substances on Growth and Cell Division in Green Algae