Search Results

You are looking at 1 - 10 of 859 items for :

  • All content x
Clear All
Free access

I.L. Goldman and J.F. Watson II

A severe dwarf mutant affecting vegetative and reproductive growth arose spontaneously in our red beet (Beta vulgaris L. subsp. vulgaris) breeding nursery and was used in crosses with inbred lines to characterize its inheritance. Segregation data in backcross and F2 generations were collected. Chi-square goodness-of-fit tests did not deviate significantly from the expected ratios for a monogenic character for each genetic background-generation combination. We propose the symbol dw to describe the genetic control of this dwarf phenotype. Greenhouse experiments were conducted to determine whether the mutant was sensitive to exogenous application of gibberellic acid (GA). GA3 and GA4/7 in concentrations of 0 to 1000 ppm were applied to apical meristems during flower stem development in vernalized dwarf plants. Data on flower stem length and leaf length were collected over a 6-week period during reproductive growth. Recovery of wild-type flower stem length was obtained with application of both types of GA. A 30-fold increase in flower stem length over untreated plants was accomplished by GA application. Results of these phenocopy experiments suggest the mutant gene is involved in GA synthesis.

Full access

Suxiao Hao, Yanfen Lu, Jing Liu, Yufen Bu, Qi Chen, Nan Ma, Zhiqin Zhou, and Yuncong Yao

concentrations of GA, resulting in dwarf phenotypes for both monocot and dicot plants; in turn, GA applications promote growth elongation ( Lohr et al., 2014 ). In the GA signal pathway, GIBBERELLIN INSENSITIVE DWARF1 (GID1) acts as the GA receptor, can combine

Free access

Patrick E. McCullough, Ted Whitwell, Lambert B. McCarty, and Haibo Liu

only tolerate long-term mowing heights 4.8 mm or greater, which produce inferior playing surfaces compared with creeping bentgrass ( Agrostis stolonifera L.) greens ( Beard, 1973 ; Foy, 1991 ). Dwarf-type bermudagrass cultivars are improved selections

Free access

Caihong Wang, Yike Tian, Emily J. Buck, Susan E. Gardiner, Hongyi Dai, and Yanli Jia

Pears are cultivated commercially in more than 50 temperate countries across the world. Their current mode of cultivation is one of intense fruit production, similar to that of apple. In the last century, many dwarfing apple rootstocks and dwarf

Open access

Taifeng Zhang, Jiajun Liu, Sikandar Amanullah, Zhuo Ding, Haonan Cui, Feishi Luan, and Peng Gao

Watermelon ( Citrullus lanatus ) is an important cucurbit crop that covers 7% of the total vegetable crop production area ( Guo et al., 2012 ). The dwarf-type plants have significant advantages in agricultural crops because of their high

Free access

S.L. Noffsinger, A.D. Draper, and C.L. Gupton

Although southern highbush (Vaccinium sp.) is replacing rabbiteye (Vaccinium ashei L.) blueberry, rabbiteye will continue to be grown on marginal soils of the southeastern United States. Dwarfism or short, compact growth habit is a trait that could be used to reduce labor costs in rabbiteye blueberry production. Parental backgrounds, and flowering and fruit traits were studied in seven Mississippi (MS) and five Georgia (T) selections. Six of the MS selections are available for propagation and bloom late enough that cold damage should not be a problem. Four (MS63, MS454, MS546, MS891) of the six have acceptable fruit quality and will be used in breeding. Ethel and MS134 were the only known dwarf ancestors, with Ethel, Myers, Black Giant, and Tifblue (Ethel × Clara) dominating the parental background. Based on the variation in growth habit and ancestries, it would appear that Ethel has several genes for dwarfism and multiple allelic interactions are involved, similar to what Garvey and Lyrene found (1987). Future breeding will include crosses of MS63, MS454, MS546, and MS891 with germplasm outside of the common ancestors, to broaden the genetic base of the dwarf rabbiteyes.

Free access

R.L. Rusholme Pilcher, J-M. Celton, S.E. Gardiner, and D.S. Tustin

are capable of fruiting earlier and producing greater yields are required. Dwarfing rootstocks that dramatically reduce the size of the grafted scion and that have also been reported to induce a higher proportion of buds to flower ( Atkinson and Else

Full access

Danise Coon, Derek W. Barchenger, and Paul W. Bosland

ornamental pepper cultivars currently available need to be pinched or sprayed with a uniconazole foliar application to achieve a dwarf or semidwarf plant habit ( Starman, 1993 ). Dwarf and semidwarf plants are generally recognized as being smaller than normal

Free access

Brian Christensen, Sridevy Sriskandarajah, and Renate Müller

). Expression of rol A in transgenic plants results in an aberrant phenotype characterized by dwarf or semidwarf plants with reduced internodes, whereas the rol B and the rol C gene seem to be important in hairy root formation. Plants transformed with rol B

Full access

Eugene K. Blythe and Jeff L. Sibley

Dwarf Burford’ holly (synonyms: ‘Burfordii Nana’ and ‘Burfordii Compacta’) was first discovered in 1947 among vegetatively propagated hollies ( Galle, 1997 ) and has historically been one of the major holly cultivars in ornamental nursery