Search Results

You are looking at 1 - 10 of 13 items for :

  • "mutant line" x
  • Refine by Access: All x
Clear All
Free access

Mauricio A. Cañoles, Randolph M. Beaudry, Chuanyou Li, and Gregg Howe

Six-carbon aldehydes and alcohols formed by tomato (Lycopersicon esculentum Mill.) leaf and fruit tissue following disruption are believed to be derived from the degradation of lipids and free fatty acids. Collectively, these C-6 volatiles comprise some of the most important aroma impact compounds. If fatty acids are the primary source of tomato volatiles, then an alteration in the fatty acid composition such as that caused by a mutation in the chloroplastic omega-3-fatty acid desaturase (ω-3 FAD), referred to as LeFAD7, found in the mutant line of `Castlemart' termed Lefad7, would be reflected in the volatile profile of disrupted leaf and fruit tissue. Leaves and fruit of the Lefad7 mutant had ≈10% to 15% of the linolenic acid (18:3) levels and about 1.5- to 3-fold higher linoleic acid (18:2) levels found in the parent line. Production of unsaturated C-6 aldehydes Z-3-hexenal, Z-3-hexenol, and E-2-hexenal and the alcohol Z-3-hexenol derived from 18:3 was markedly reduced in disrupted leaf and fruit tissue of the Lefad7 mutant line. Conversely, the production of the saturated C-6 aldehyde hexanal and its alcohol, hexanol, were markedly higher in the mutant line. The shift in the volatile profile brought about by the loss of chloroplastic FAD activity in the Lefad7 line was detected by sensory panels at high significance levels (P < 0.0005) and detrimentally affected fruit sensory quality. The ratios and amounts of C-6 saturated and unsaturated aldehydes and alcohols produced by tomato were dependent on substrate levels, suggesting that practices that alter the content of linoleic and linolenic acids or change their ratios can influence tomato flavor.

Free access

Edward J. Ryder and David C. Milligan

Six genes controlling flowering time or bolting time in Lactuca L. have been reported. Several crosses between parents differing in time to opening of first flower were made to ascertain the inheritance of additional flowering time traits in Lactuca species. The parents in the crosses were of five flowering classes: very late (VL), late (L), early (E), very early (VE), and very, very early (VVE). Segregation from a cross between C-2-1-1 (VL) (L. sativa L.) and `Vanguard 75' (L) confirmed that `Vanguard 75' flowering was controlled by the previously identified gene Ef-2ef-2. Mutant line 87-41M-7 (VVE) was crossed by D-3-22M (VE) and segregated 3VVE:1 VE, indicating a dominant allele, Ef-3, that decreased flowering time an additional 7 days. Cos-like line 796 (VE) was crossed to cultivars Salinas (VL) and Vanguard 75. Segregation indicated a gene Ef-4ef-4, with lateness dominant. PI 175735 (E) (L. serriola L.), crossed with C-2-1-1 produced an F2 population with a bimodal distribution, segregating 3 E:1 VL, indicating a single gene Ef-5ef-5. PI 236396 (E) and PI 250020 (E) were crossed to `Salinas' and `Vanguard 75'. Segregation and morphological similarity indicated the same gene in both PI lines, Ef-6ef-6, with earliness dominant.

Free access

Zhoo-Hyeon Kim

New four traits not yet reported were founded. One mutant plant was from a population of 81-1251-D-20M treated with EMS (ethylmethane sulfonate), which had tubular petals. This tubular petal plant had normal pollens in anthers, but could almost not produce its seeds without artificial pollination. It was controlled by one single recessive gene. One new spontaneous dwarf mutant line, R3-10, which bore seedcoatless-like seeds with short pappus, was crossed with normal breeding lines GL5 and 87-25M-2M. From F2 and F3 results, it was found that the two traits (seedcoatless-like and short pappus) were governed by each one single recessive gene. A stem lettuce type cultivar, `Baimach', seemed to be almost green, but was really tinged red, which was extremely suppressed in red color expression. Its tinged red color could not be seen, except on only very limited base parts of the stem and dorsal petal. In two F2 population experiments of the crosses of `Baimach' with `Oakleaf' and 98-43-3, it was found that the suppression of red color expression in `Baimach' was caused by a single recessive gene. It looked different from that of gene “v” (vanishing) by Lindqvist, because the red color of plants with “v” gene of Lindqvist were typically tinged and could be identified easily at a young plant stage, but not that of `Baimach'. I designated these new four genes as Tu-tu (Tu = normal, tu = tubular petal), Pp-pp (Pp = normal, pp = short pappus), Scl-scl (Scl = normal, scl = seedcoatless-like), and In-in (In = normal, in = inhibiting red color expression extremely).

Free access

Shaoyun Lu, Zhongcheng Wang, Yuejing Niu, Zhenfei Guo, and Bingru Huang

exhibited a more dwarf habit and had a more compact turf canopy than the wild type ( Fig. 1 ). In addition, mutant line 7-9 exhibited creeping growth. Fig. 1. The dwarf mutant lines (7-9, 10-5, and 10-12) in comparison with the wild-type control (CK

Free access

Qiubin Xiao and J. Brent Loy

. Petiole surface of a nonglabrous ( A ) plant derived from the original mutant S 2 segregating line (YSN5-5) and a glabrous ( B ) plant derived from the original S 2 mutant line (YSN5-3) in Cucurbita pepo . Magnification is 15×. Numerous slender

Free access

Taifeng Zhang, Jiajun Liu, Shi Liu, Zhuo Ding, Feishi Luan, and Peng Gao

Hwang et al. (2014) , who reported dwarf gene mdw1 from the diminutive (short internodes) melon mutant line ‘PNU-D1’. However, ‘PNU-D1’ belongs to the loose dwarf type according to seedling and adult pictures ( Hwang et al., 2014 ), whereas the ‘X090

Free access

Jia-yi Wang, Jian-shuang Shen, Mengmeng Gu, Jia Wang, Tang-ren Cheng, Hui-tang Pan, and Qi-xiang Zhang

, physiological, and ultrastructural responses of Populus cathayana to chilling J. Expt. Bot. 62 675 686 Zhang, X.M. Sun, S.F. Li, F.H. Wang, J. Shi, Z.S. 2015 Photosynthesis of a yellow-green mutant line in maize Photosynthetica 53 499 505 Zhang, Z.W. Zhang, B

Free access

Peter J. Mes, Peter Boches, James R. Myers, and Robert Durst

. An Aft-atvatv double mutant line with “normal” red color from typical lycopene and β-carotene expression was crossed to the orange LA2374 ( B ) and yellow LA3532 ( r ) tomato accessions and advanced to the F 2 generation by Summer 2004. No

Free access

Choun-Sea Lin, Nien-Tzu Liu, De-Chih Liao, Jau-Song Yu, Chuang-Hwei Tsao, Chao-Hsiung Lin, Chih-Wen Sun, Wann-Neng Jane, Hsing Sheng Tsay, Jeremy Jian-Wei Chen, Erh-Min Lai, Na-Sheng Lin, Wei-Chin Chang, and Chung-Chih Lin

regulated at the mRNA level but at the protein level. Materials and Methods Plant materials. Multiple shoots of Bambusa edulis were induced in a long-term tissue culture system ( Lin and Chang, 1998 ), an albino mutant line generated