Effect of Gibberellin and Uniconazole on Mesocotyl Elongation of Dark-Grown Maize under Different Seeding Depths

Zhao, Guangyao; Wang, Jianhua

doi:10.1626/pps.11.423

Cited by 28 publications

(21 citation statements)

References 25 publications

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“…Plants treated with 8 ppm uniconazole, 30 ppm paclobutrazol, and 15 ppm flurprimidol drenches had thicker and darker green leaves. Zhao and Wang (2008) found suppressed internode elongation occurred due to a reduction in cell length but not cell number.…”

Section: Resultsmentioning

confidence: 94%

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Rezazadeh¹,

Harkess²

2015

hortte

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Purple firespike (Odontonema callistachyum), native to Central America, has potential for use as a new flowering potted plant. The effects of number of pinches (zero, one, or two) and number of cuttings (one, two, or three) per 6-inch pot were evaluated on the control of plant height. Plant height was suppressed as the pinch number increased. The greatest reduction was recorded with one cutting per pot and two pinches. The maximum number of branches per pot was recorded with two pinches and three cuttings per pot. In a second experiment, plant growth regulators (PGR) were also tested for efficacy of height control; 2 weeks after pinching, foliar sprays of paclobutrazol, flurprimidol, daminozide, chlormequat, and a tank-mix of daminozide + chlormequat or media drenches of paclobutrazol, uniconazole, or flurprimidol were applied. Plant height, leaf area, and leaf dry weight were recorded at 3, 6, and 9 weeks after PGR application. Maximum height control was obtained with uniconazole drench at 8 ppm, resulting in plants 22 cm tall, 61% shorter than the untreated control (56 cm); however, it resulted in severe leaf distortion. Plant height was 56% and 46% shorter than the control using drenches of paclobutrazol at 30 ppm and flurprimidol at 15 ppm, respectively. Daminozide spray at 2000 ppm and tank-mix of daminozide + chlormequat at 4500/1500 ppm suppressed stem elongation by 20.3% and 19%, respectively. Plants treated with paclobutrazol drench at 30 ppm reduced leaf area and leaf dry weight compared with other PGRs. Chlormequat spray at tested concentrations was ineffective for controlling firespike plant growth. The most attractive potted plants were produced using a drench application of paclobutrazol at 10 or 15 ppm.

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Section: Resultsmentioning

confidence: 94%

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Rezazadeh¹,

Harkess²

2015

hortte

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“…Developing maize tolerant to deep‐sowing is an important objective of maize breeding because it allows this crop to be cultivated in the arid and semi‐arid regions. In the previous study, we reported that a maize inbred line called 3681‐4 from Hopi Indian corn germplasm was developed (Zhao and Wang 2008). The line may tolerate deep‐sowing conditions, for its mesocotyl can elongate to emerge from 20 to 30 cm deep soil layer.…”

mentioning

confidence: 99%

“…Hitherto, a limited progress has been made in the mechanism of how mesocotyl elongation is regulated by gibberellin (GA). Our previous study showed that gibberellic acid (GA 3 ) promoted maize mesocotyl elongation at concentrations higher than 10 −6 m and the most significant promotion occurred at the concentration of 10 −5 m (Zhao and Wang 2008). The results suggested that GA played an important regulatory role in maize mesocotyl elongation.…”

mentioning

confidence: 99%

Gibberellin-induced mesocotyl elongation in deep-sowing tolerant maize inbred line 3681-4

Zhao

Wang

et al. 2010

Plant Breeding

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In order to elucidate the molecular mechanism of gibberellin (GA)-induced mesocotyl elongation, gene expression profiling analyses were performed in a deep-sowing tolerant maize inbred line 3681-4. Gene expression studies combining Affymetrix GeneChip analysis and Realtime PCR were employed to determine the molecular mechanism underlying GA promotion of maize mesocotyl elongation. These studies showed that a mount of genes, such as the GA receptor GID1, the transcriptional factor MYB, and the genes encoding the DELLA protein DWRF8, kinases, Raf, LRR and RLCK, might play a critical role in maize mesocotyl elongation. Moreover, the genes that were involved in flavonoid biosynthesis, aminosugars metabolism, cell wall synthesis and modification were also found to be responsible for this process.

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“…Uniconazole, on the other hand, reduced the production of floral stems by inhibiting their elongation, most likely through inhibition of cell division and cell elongation (Bosner and Aarsen, 2003;Naor et al, 2005). The smaller tubers in the Uniconazole treated plants, on the other hand, are probably the result of the general inhibition of growth induced by this growth regulator (Bosner and Aarsen, 2003;Zhao and Wang, 2008). It can be argued that different growth mechanisms are responsible for the reduction in tuber size by GA 3 and Uniconazole.…”

Section: Leaf Area Length Of Inflorescence Peduncle and Tuber Sizementioning

confidence: 99%

The relationships between gibberellin and organ size in colored <i>Zantedeschia</i> cv. ‘Calla Gold’

Naor¹,

Kigel

Ziv

2009

Israel Journal of Plant Sciences

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Involvement of gibberellin in the regulation of size and shape of different plant organs (leaf, floral stem, and tuber) were studied in colored Zantedeschia cv. 'Calla Gold' (CG). The effect of gibberellin on allometric relationships between these organs was also examined. Tubers were dipped in solutions of GA 3 (0.6 mM) or of the gibberellin biosynthesis inhibitor Uniconazole (3.4 mM) prior to storage, prior to planting, or twice-before storage and before planting. The effects of the growth regulators were followed in plants grown in pots in a screen house under 50% shade. Tuber weight was reduced by both GA 3 and Uniconazole, but by different processes. GA 3 increased the number of the floral stems per plant, but did not affect floral stem length or blade and petiole length. Uniconazole reduced the proportion of flowering plants, and inhibited leaf and stem elongation. Co-application with GA 3 canceled the inhibitory action of Uniconazole on leaf and peduncle elongation. This suggests that gibberellin is involved in the regulation of organ elongation, despite lack of direct effect of exogenous GA 3 application. Linear positive relationships were found across the different treatments between tuber weight vs. leaf area, petiole length vs. blade length, petiole length vs. floral stem length, and blade length vs. floral stem length. The constancy in size relationships suggests that the action of the growth regulators on the growth of the different organs were according to intrinsic allometric relationships among them. The differential action of GA 3 on flowering and on stem and leaf elongation is discussed.

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Effect of Gibberellin and Uniconazole on Mesocotyl Elongation of Dark-Grown Maize under Different Seeding Depths

Cited by 28 publications

References 25 publications

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Gibberellin-induced mesocotyl elongation in deep-sowing tolerant maize inbred line 3681-4

The relationships between gibberellin and organ size in colored <i>Zantedeschia</i> cv. ‘Calla Gold’

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