Search Results

You are looking at 11 - 20 of 628 items for :

  • "cytokinins" x
  • Refine by Access: All x
Clear All
Free access

Michelle DaCosta and Bingru Huang

responses of plants to environmental stresses. Abscisic acid (ABA) and cytokinins are two major groups of plant hormones that play important roles in regulating plant responses to decreases in soil water availability ( Pospíšilová et al., 2000 ; Wilkinson

Free access

J. Kevin Parris, Darren H. Touchell, Thomas G. Ranney, and Jeffrey Adelberg

( Kamenicka and Lanakova, 2000 ). Although several cytokinins have been used to induce shoot proliferation, BAP has been used most often for magnolia. For Magnolia × soulangeana, 1.2 μM BAP was shown to produce greater shoot proliferation than 2iP, kinetin

Free access

Jinpeng Xing, Yan Xu, Jiang Tian, Thomas Gianfagna, and Bingru Huang

of leaves as chlorophyll and other cellular components (e.g., proteins and nucleic acids) are degraded during natural or stress-induced leaf aging. Cytokinins (CK) have been well known for delaying leaf senescence, and in some cases, reversing this

Free access

Qiang Liu and Yiwei Jiang

) water (W); 2) 10 m m urea (N10); 3) 20 m m urea (N20); 4) 15 µ m cytokinin (transzeatin riboside, ZR) (CK); 5) 10 m m urea + 15 µ m cytokinin (N10CK); and 6) 20 m m urea + 15 µ m cytokinin (N20CK). Pots were sprayed with 10 mL of solutions at each

Free access

Don C. Elfving and Dwayne B. Visser

; Miller, 1983 ). The interaction of endogenous auxins and cytokinins is thought to play a role in the control by apical dominance of lateral bud activity in the spring and during shoot development ( Sachs and Thimann, 1967 ; Theron et al., 1987 ; Wickson

Full access

Shahzad M.A. Basra and Carol J. Lovatt

, cytokinins, gibberellins (GAs), abscisic acid (ABA), and ethylene. Hence, the tools needed by the organic horticulture industry are known, but remain largely unavailable for use in commercial organic crop production. In addition, there are only a few

Free access

Michael W. Bairu, Manoj G. Kulkarni, Renée A. Street, Rofhiwa B. Mulaudzi, and Johannes Van Staden

. Shoot multiplication. After bulking sufficient explants using the previously described procedure, experiments to investigate the effects of type and concentration of cytokinin on shoot multiplication and incidence of abnormality were designed

Open access

Syuan-You Lin and Shinsuke Agehara

reduction in ‘Natchez’ blackberry, suggesting its potential negative side effects on floral development ( Lin and Agehara, 2020 ). Cytokinins act as an antagonist of GA during floral transition in apple ( Malus × domestica Borkh.) by upregulating the

Free access

Shunzhao Sui, Jianghui Luo, Daofeng Liu, Jing Ma, Weiting Men, Lu Fan, Yu Bai, and Mingyang Li

). Furthermore, it is known that GA 3 acts as an antagonist to ABA or ethylene action, thereby delaying flower senescence ( Hunter et al., 2004a , 2004b ; Lü et al., 2014 ). It has also been noted that cytokinins delay petal senescence in both ethylene

Free access

Hae-Jeen Bang, Soo-Jung Hwang, Hee Chung, and Jung-Myung Lee

Soybean sprouts are one of the most-favored traditional vegetables around the world. The sprouts are usually consumed 7 to 10 days after sowing depending upon the growing conditions. High-quality sprouts should have less secondary roots, short and well-swollen hypocotyls in pure white color, and small cotyledons in hooked position. Cytokinins were reported to be effective in producing such sprouts by promoting sprout growth while inhibiting the excessive hypocotyl elongation and secondary root growth. Seeds of four soybean cultivars with different characteristics were soaked in water for 4 h and, 2 to 3 h after the imbibition, the seeds were soaked again in solutions of different cytokinins such as benzyladenine (BA), BA-riboside (BAR), BPA, 2iP, 2iP-riboside, 4-CPPU, and kinetin-riboside (KR) for 10 min. After the treatment, the sprouts were grown in a plastic tube (25 cm height × 10.5 cm diameter) a dark culture room with ample watering every 4 h. After 7 days of growth, uniform samples were taken from each treatment and the sprout characteristics were examined. Some cytokinins such as BA, BAR, 4-CPPU were highly effective in promoting the sprout growth (fresh weight) even though the hypocotyl length was markedly reduced. Other cytokinins such as 2iP, 2iPR, and KR had no effect on sprout growth. Hypocotyl diameter was markedly increased by BA and 4-CPPU treatment, thus resulting in short, strong and good quality sprouts. Cultivars responded differently to cytokinin treatment by showing different growth promotion depending upon the sprout parts. Injury-like symptoms, abnormal and twisted heads or cotyledons, appeared in cytokinin-treated sprouts at high concentrations and the symptoms were severe when the sprouts were grown at high temperatures. In all the cultivars tested, BAR appeared to be better than others in terms of sprout quality and growth promoting characteristics.