Peduncle explants from 12 Brassica oleracea L. lines representing five varieties [broccoli (italica), cabbage (capitata), cauliflower (botrytis), Chinese broccoli (alboglabra), and rapid-cycling B. oleracea] readily regenerated shoots in vitro. Average regeneration rates of more than 75% were obtained for most lines, with up to 35 shoots per explant. Shoots were visible within 7 to 10 days. Initial regeneration was polarized, occurring mainly from the basal end of explants. Linsmaier-Skoog-based medium containing 1 mg BA/liter was suitable for shoot regeneration from all 12 lines tested. Plants were rooted on hormone-free medium and transferred to soil. Chemical name used: benzyladenine (BA).
Mary C. Christey and Elizabeth D. Earle
Mengzi Zhang, Jie Yang, Huitang Pan and Brian J. Pearson
develop long flower peduncles that can result in lodging and decreased commercial marketability. Therefore, controlling the height of baby primrose in greenhouse environments is critical to its potential commercial success. Plant growth regulators (PGRs
J. Raymond Kessler Jr. and Gary J. Keever
Vegetative offsets of Achillea x `Coronation Gold' were rooted under mist for 3 weeks and potted into 10-cm pots in a greenhouse. Plants were grown under short photoperiods for 6 weeks before being vernalized for 6 weeks at 6 °C. Plants then were provided long photoperiods from night-break lighting. Foliar sprays of daminozide at 0, 2550, 5100, or 7650 mg·L-1, chlormequat at 0, 767, 1534, or 3201 mg·L-1, daminozide + chlormequat at 0, 1275 +, 2550 + or 3825+1534 mg·L-1, flurprimidol at 0, 40, 80, or 120 mg·L-1, paclobutrazol at 0, 32, 64, 96, 128, or 160 mg·L-1 or uniconizole at 0, 11, 22, 33, 44, or 55 mg·L-1 were applied as a spray 1 week after vernalization. Highest market quality ratings were achieved with paclobutrazol at 96 or 128, uniconizole at 22 or 33, daminozide + chlormequat 3825 + 1534, chlormequat at 2301 or flurprimidol at 40 mg·L-1. Peduncle length and growth index decreased linearly for daminozide, chlormequat, and daminozide + chlormequat, and decreased quadratically for flurprimidol, paclobutrazol, and uniconizole with increasing rate. Time to flower increased most in treatments receiving high rates of daminozide. Flower diameter was reduced by the highest rates of flurprimidol and paclobutrazol.
Bruno Razeto and Jorge Salgado
A tissue analysis trial for the diagnosis of nitrogen level was performed during the 2001 growing season in Paine County, Metropolitan Region, Chile. Seven-year-old `Hass' avocado (Persea americana Mill.) trees were soil treated with urea at rates of 0, 333, 666, and 999 g N/tree, split in two applications (2 and 4 months after fruit set). Each treatment was applied to three randomly selected trees. Fifty spring flush leaves and fifteen fruit peduncles were taken per tree 4 months after application. Two months later, 70 panicles per tree were taken, and nitrogen concentration in these samples was determined by Kjeldahl digestion. Differences between treatments were better detected in peduncle and inflorescence samples than in leaf samples. The relationship between nitrogen dose and nitrogen concentration in the tissue was R 2 = 0.67, 0.65, and 0.56 in peduncle, leaf, and inflorescence, respectively. Consequently, peduncle appears a promising tissue, probably better than leaf, for diagnosing the nitrogen status of avocado trees.
Thomas O. Athoo, Andreas Winkler and Moritz Knoche
high resolution using Archimedes' principle J. Expt. Bot. 40 1069 1078 Linke, M. Herppich, W.B. Geyer, M. 2010 Green peduncles may indicate postharvest freshness of sweet cherries Postharvest Biol. Technol. 58 135 141 Manganaris, G.A. Ilias, I
Winston Elibox and Pathmanathan Umaharan
of the spathe, spadix length and carriage, straightness of the peduncle and peduncle length, overall symmetry of the cut flower, and productivity ( Kamemoto and Kuehnle, 1996 ; Kamemoto et al., 1986 ). Anthurium andraeanum Linden ex André was first
Aidan D. Farrell, Sarah Evelyn, Adrian M. Lennon and Pathmanathan Umaharan
Anthurium ( Anthurium andraeanum Hort.) is a herbaceous tropical perennial highly sought after on the world market as a cut flower. The bloom is composed of a modified bract (spathe) and a stalk-like inflorescence (spadix) supported on a peduncle
Jennifer Han, Jan E. Murray, Qingyi Yu, Paul H. Moore and Ray Ming
-linked traits such as peduncle length and inflorescence branch number. The vegetative forms of the three sex types of papaya are phenotypically homomorphic but the reproductively mature trees are morphologically distinct. Male trees develop long, pendulous
Sea Yeat Choon and Phebe Ding
separate leafless peduncle arising from the underground rhizome ( Choon and Ding, 2016 ). The height of the leaf stalk is ≈3–4 m whereas the peduncle length is ≈0.7 m. The torch ginger inflorescence is composed of involucral and floral bracts. The
Meng Li, Huanhuan Zhi and Yu Dong
soft fruit, such as dull skin color, surface pitting, and peduncle browning after storage or shipping, negatively impacts consumer purchase decisions ( Turner et al., 2005 ; Zheng et al., 2016 ). The causes of fruit softening are largely attributed to