The relationship among gibberellins, C vernalization, and photoperiod in the flowering response of radish, Raphanus sativus L., cv. Miyashige-sofuto, was studied. The optimal condition for flowering was vernalization and a 16-hour photoperiod; GA3 had no additional effect. Gibberellin A3 (60 ,jg total) was not able to induce flowering in nonvernalized plants grown on 8-hour days, but it did inc...

The aim of the current study was to isolate endophytes from roots Rhazya stricta and assess their potential improve growth drought-stressed sunflower seedlings. role isolated endophytic fungus initially screened by using two rice varieties (mutant cultivar Waito-C: Gibberellins deficient; Dongji byeo: Gibberellins-producing normal cultivar). A significant (p < 0.05) increase in various attri...

The author wishes to thank Professor Kenneth V. Thimann for reading the manuscript, and for his valuable criticism and suggestions during the progress of the research, which are greatly appreciated. Professor Edward S. Castle's stimulating comments on reading the manuscript are gratefully acknowledged. The author also wishes to thank M\rs. Irmgard Kurland for her help in drawing the illustrations.

Gibberellin influences the rest period or dormancy of seeds (4), shoots (1), and other plant parts (2, 5, 9). In potato, Solanum tuberosum, a condition of physiological rest prevails from the time of tuber initiation until 6 to 12 weeks after harvest depending on varietal characteristics (3). The rest period has been markedly curtailed by immersing freshly harvested potato tubers in gibberellin...

Gibberellins (GAs) are plant growth regulators that are known to stimulate physiological responses in plants and alter the source–sink metabolism through their effect on photosynthesis and sink formation. GAs promote fructose-1,6-biphosphatase and sucrose phosphate synthase and stimulate phloem loading. Photosynthate translocation from source to the developing sink is a major contributing facto...

\Wirwille and M1itchell reported that apl)lications of 2'-isoprol)vl-4'(trimethv lammllonium chloride) -5'methylphenvl piperidine-1-carboxvlate (Amo 1618) (fig 1, I) to several types of flowNering plants led to ani abnormial growth habit characterized by shorter stemiis and initernodes (17). Amo 1618 is one of the mllost active of several carbamate esters containiing a q uarternarv ami-moniiumi...

Bacteria are abundantly present in the soil, interact with plant roots in the rhizosphere and enhance plant growth and development in certain instances. The plant growth promoting rhizobacteria (PGPR) develop a mutualistic relationship with the host plants and gives a benefit to them through N2 fixation by nitrogenase, nitrate reductase activity, siderophore production, and phytohormone secreti...