How does cytokinin influence plant growth?
Cytokinins are essential plant hormones. By stimulating cell division, they regulate shoot meristem size, leaf primordia number, and leaf and shoot growth. They can stimulate both the differentiation and the outgrowth of axillary buds. The cytokinins can mediate axillary bud release from apical dominance.
Is cytokinin a growth promoter?
Auxins and cytokinins are major growth promoters and morphogens (Table 3-7, Fig.
Is gibberellin a growth promoter?
Gibberellins are plant growth regulators that facilitate cell elongation, help the plants to grow taller. They also play major roles in germination, elongation of the stem, fruit ripening and flowering.Sep 12, 2020
Is abscisic acid a growth promoter?
Abscisic acid (ABA) is accepted as one of the five major classes of natural plant growth regulators. In many tests ABA inhibits growth and metabolism, and enhances degradative changes, as in ripening and senescence.
Is cytokinin a plant growth inhibitor?
Numerous reports ascribe a stimulatory or inhibitory function to cytokinins in different developmental processes such as root growth and branching, control of apical dominance in the shoot, chloroplast development, and leaf senescence (4).
Is cytokinin a growth inhibitor?
Abscisic acid and ethylene are inhibitor phytohormones whereas auxins, cytokinins and gibberellins are plant growth promoters.
Is cytokinin an inhibitor?
Cytokinin hormones regulate a wide range of essential processes in plants. Thidiazuron (N-phenyl-N'-1,2,3-thiadiazol-5-yl urea, TDZ), formerly registered as a cotton defoliant, is a well known inhibitor of cytokinin oxidase/dehydrogenase (CKX), an enzyme catalyzing the degradation of cytokinins.
Is cytokinins a plant growth regulator?
These results suggest that cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots. Cytokinins were discovered during the 1950s because of their ability to induce plant cell division (1).
Is cytokinin a growth promoter or inhibitor?
Auxins, Gibberellins, and Cytokinins are grouped into Plant growth promoters while Abscisic acid and Ethylene are grouped into Plant growth inhibitors.
Which hormone is both growth promoter and inhibitor?
Ethylene can act as both growth promoter as well as inhibitor.
Which hormone is growth inhibitor?
ABA or abscisic acid is a plant hormone that acts as a growth inhibitor. It can inhibit shoot growth and stimulate closure of stomata.