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Luis A. Valdez-Aguilar, Catherine M. Grieve, James Poss and Michael A. Mellano

roots exhibiting the development of new shoots emerging above the sand surface were recorded. Sprouting percentage was calculated daily by dividing the number of tuberous roots with shoot emergence by the total number of tuberous roots transplanted. Data

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Raja Ram, Debasish Mukherjee and Sandeep Manuja

The effects of BA, ethephon, and GA3 on freshly harvested cormels of three cultivars of Gladiolus sp. were studied for 3 years. The treatment with 400 mg·L-1 ethephon significantly reduced the dormancy period by 17.5 days as compared to control, while BA and GA3 were found to be less effective. Among all treatments, ethepon at 400 mg·L-1 was found to be the most effective in altering the days to sprout, sprouting percentage, corm size and production and development of cormels. While GA3 at 100 mg·L-1 increased growth of corms and cormels, BA at 25 mg·L-1 increased growth of corms and cormels. BA at 25 mg·L-1 only influenced the sprouting percentage of cormels. Along with reducing the dormancy period, the plant growth regulators stimulated growth and development of corms and cormels. Chemical names used: benzyladenine (BA); 2-chloroethylphosphonic acid (ethephon); gibberellic acid (GA3).

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Sushobitbir Singh Thind, Harmander Pal Singh and Sukhdev Singh

Peach [Prunus persica Batsch. (L.)] is a major fruit of northern India, which is commercially propagated through stem cuttings. There is a scarcity of information available on the effect of plant growth regulators (PGRs) and time of plantings on rooting of peach stem cuttings. Studies were conducted to learn the effects of various PGRs and planting times on stem cuttings of peach cv. Shan-i-Punjab at the fruit nursery of the Horticulture Department, Khalsa College, Amritsar, India, in 2001 and 2002. The study on stem cuttings, taken from the middle portion of the shoot, compared three PGRs: indolebutyric acid (IBA), indoleacetic acid (IAA), and naphthaleneacetic acid (NAA), each at concentrations of 50, 100, and 200 mg·L-1 and two planting dates (20 Dec. and 20 Jan.). Cuttings were treated for 24 hours before keeping under moist sand for 1 month for callusing. Callused cuttings were planted in the field. Measurements on sprouting percentage, survival percentage, plant height, shoot diameter, number of leaves per plant, leaf size, average root length, and root weight per cutting were recorded. The study showed that, overall, auxins had significant effect on the success and rooting character of peach plants over the control. The greatest sprouting and survival percentage, plant height, leaf area, and shoot diameter was exhibited by IBA followed by IAA and NAA. IBA at 100 ppm proved to be the most suitable PGR for improving success along with other rooting and vegetative characters of the plant. The cuttings planted on 20 Dec. gave a higher percentage of success (55.32%) over those planted on 20 Jan. (33.04 %), during both years of study. The other plant characteristics, such as average root length, plant height, leaf area, and plant height, of cuttings planted on 20 Dec. also showed greater success during both years.

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Aekaterini N. Martini, Maria Papafotiou and Stavros N. Vemmos

mainly in March and August with difficulty. Explants from sprouts collected in May formed only callus. A similar response was also found previously for explants excised from adult plants ( Papafotiou and Martini, 2009b ). The bud sprouting percentage was

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Inmaculada Vila, Ester Sales, Javier Ollero, Jesús Muñoz-Bertomeu, Juan Segura and Isabel Arrillaga

/2 (81.2% and 78.1% versus 69.8% and 60.4%, respectively; P ≤ 0.05). BA was also more effective for axillary bud breaking than TDZ (82.3% versus 62.5%, respectively; P ≤ 0.05); furthermore, BM with 8.8 μM TDZ drastically reduced the sprouting

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Chunxian Chen, William R. Okie and Thomas G. Beckman

assess frost tolerance ( Rieger et al., 1991 ). Several fruitlet and shoot growth measures, including fruitlet number and size, pit hardness, sprout percentage, etc., were also used for the tolerance evaluation ( Assmann et al., 2008 ). Although

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Benjamin Ewa Ubi, Daisuke Sakamoto, Yusuke Ban, Takehiko Shimada, Akiko Ito, Ikuko Nakajima, Yoshihiro Takemura, Fumio Tamura, Toshihiro Saito and Takaya Moriguchi

transitional phases. The seasonal changes in the endodormancy transition phases assessed in the lateral leaf buds from early Sept. 2008 to mid-Feb. 2009 are shown in Fig. 4A . In early September, the sprouting percentage in ‘Kosui’ was 8% and declined to 0