scholarly journals Abscisin II and , some. Hormone-Regulated Plant Responses

1967 ◽  
Vol 20 (5) ◽  
pp. 869 ◽  
Author(s):  
D Aspinall ◽  
LG Paleg ◽  
FT Addicott
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Seedling Growth ◽  
Growth Regulators ◽  
The Other ◽  
Plant Responses ◽  
Acid Gas ◽  
Radicle Elongation ◽  
Other Hand

The aotivity of (�)-absoisin II' [(�)AbII] and its interaction with a number of plant growth regulators in the oontrol of lettuce germination, lettuoe hypoootyl and radiole elongation, ououmber seedling growth, radish lea ( senesoenoe, and barley vernalization were examined. The interac.tions between (� )AbII and th�;l promoting h~rmones were of two general types. In gibberellio acid (GAs)-promoted lettuoe germination and kinetin-oontrolled leaf senesoenoe, the effeots of low ooncentrations of ( � )-!\bII were oompletely overoome by high oonoentratioileof the other substanoe. In .the second type of interaction, (� )AbII was inhibitory only in the presenoe of high oonoentrations of the promoter (kinetin in lettuce germinatipn and allogibberio acid in lettuoe radicle elongation). Cuoumber radiole elongation, on the other hand, was promoted by (� )AbII in the presenoe of a mixture of GA4 and GA7.

scholarly journals Application of Plant Extracts in Micropropagation and Cryopreservation of Bleeding Heart: An Ornamental-Medicinal Plant Species

Agriculture ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 542
Author(s):  
Dariusz Kulus ◽  
Natalia Miler
Keyword(s):  
Tissue Culture ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Plant Extracts ◽  
The Other ◽  
White Gold ◽  
Natural Extracts ◽  
Other Hand ◽  
The Impact

Lamprocapnos spectabilis (L.) Fukuhara (bleeding heart) is valued both in the horticultural and pharmaceutical markets. Despite its great popularity, information on the in vitro tissue culture technology in this species is limited. There is also little knowledge on the application of plant extracts in the tissue culture systems of plants other than orchids. The aim of this study is to compare the utility of traditional plant growth regulators (PGRs) and natural extracts—obtained from the coconut shreds, as well as oat, rice, and sesame seeds—in the micropropagation and cryopreservation of L. spectabilis ‘Gold Heart’ and ‘White Gold’. The biochemical analysis of extracts composition is also included. In the first experiment related to micropropagation via axillary buds activation, the single-node explants were cultured for a 10-week-long propagation cycle in the modified Murashige and Skoog medium fortified either with 1.11 µM benzyladenine (BA) and 1.23 µM indole-3-butritic acid (IBA) or with 10% (v/v) plant extracts. A PGRs- and extract-free control was also considered. In the cryopreservation experiment, the same 10% (v/v) extracts were added into the medium during a seven-day preculture in the encapsulation-vitrification cryopreservation protocol. It was found that the impact of natural additives was cultivar- and trait-specific. In the first experiment, the addition of coconut extract favoured the proliferation of shoots and propagation ratio in bleeding heart ‘Gold Heart’. Rice extract, on the other hand, promoted callus formation in ‘White Gold’ cultivar and was more effective in increasing the propagation ratio in this cultivar than the conventional plant growth regulators (4.1 and 2.6, respectively). Sesame extract suppressed the development of the explants in both cultivars analysed, probably due to the high content of polyphenols. As for the second experiment, the addition of plant extracts into the preculture medium did not increase the survival level of the cryopreserved shoot tips (sesame and oat extracts even decreased this parameter). On the other hand, coconut extract, abundant in simple sugars and endogenous cytokinins, stimulated a more intensive proliferation and growth of shoots after rewarming of samples. Analysing the synergistic effect of conventional plant growth regulators and natural extracts should be considered in future studies related to L. spectabilis.

scholarly journals Quantitative and Morphological Effect of Plant Growth Regulators on Callus Initiation from Leaves and Roots Explants of Artemisia annua L.

2020 ◽  
Vol 9 ◽  
pp. 11-17
Author(s):  
Wajeeha Iffat ◽  
Sohail Hussain
Keyword(s):  
Growth Hormone ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Artemisia Annua ◽  
The Other ◽  
Other Hand ◽  
The Media ◽  
Leaves And Roots ◽  
Artemisinin Content

To study the effect of some plant growth regulators on the in vitro initiation of callus using the leaves and roots explants of Artemisia annua. The experiment was arranged in a completely randomized design with 2 replicates. Morphologically leaf explants culture in media having the composition MS Basal + NAA (2.0mg/l) + BA(1.0 mg/l) shows best results as compared to all other media. However in roots shows no growth in all the media composition. On the other hand media having a composition (MS Basal + 2,4-D(1.0mg/l) + Kn (0.1mg/l)) with growth hormone antagonist shows no callus formation neither in leaf or roots. Our studies are also supported by the HPLC results about the artemisinin content in leaf in media having the composition MS Basal + NAA (2.0mg/l) + BA(1.0 mg/l) is 0.052% and least in media a composition (MS Basal + 2,4-D(1.0mg/l) + Kn (0.1mg/l)) have only 0.012%. On the other hand, we didn’t found any artemisinin content in the root explants in all the media. Our present study suggest that Benzyl adenine (BA) could be used as a promising growth hormone in tissue culture.

scholarly journals Genes Encoding Cucumber Full-Size ABCG Proteins Show Different Responses to Plant Growth Regulators and Sclareolide

2015 ◽  
Vol 34 (4) ◽  
pp. 720-736 ◽  
Author(s):  
Adam Rajsz ◽  
Anna Warzybok ◽  
Magdalena Migocka
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Expression Profiles ◽  
Plant Responses ◽  
Full Size ◽  
Genes Encoding ◽  
Plant Genes ◽  
Cucumber Roots

AbstractFull-size members of the ABCG (ATP-binding cassette, subfamily G) subfamily of ABC transporters have been found only in plants and fungi. The plant genes encoding full-size ABCGs identified so far appeared to be differentially regulated under various environmental constraints, plant growth regulators, and microbial elicitors, indicating a broad functional role of these proteins in plant responses to abiotic and biotic stress. Nevertheless, the structure and physiological function of full-size ABCGs in many plant species are still unknown. We have recently identified 16 genes encoding full-size ABCG proteins in cucumber and found that the transcripts of two of them, CsABCG36 (CsPDR8) and CsABCG40 (CsPDR12), are most abundant in roots and are significantly affected by phytohormones and auxin herbicide. In this study, we analyzed the structure and phylogeny of all the full-size cucumber ABCG transporters and studied the organ expression profiles of the remaining 14 CsABCG genes. In addition, we investigated the effect of different plant growth regulators and the diterpene sclareolide on CsABCG expression in cucumber roots. Until now, the full-size plant ABCG transporters have been grouped into five different clusters. The new phylogenetic analysis of full-size ABCGs from model plants and cucumber clustered these proteins into six different subgroups. Interestingly, the expression profiles of cucumber ABCG genes assigned to the same clusters were not correlated, suggesting functional diversification or different regulatory mechanisms of the full-size cucumber ABCG proteins.

scholarly journals Paclobutrazol, Uniconazole, or Flurprimidol Applied at Various Concentrations as a Substrate Drench or Through Subirrigation Have Little Effect on Bee Balm Growth

2014 ◽  
Vol 24 (3) ◽  
pp. 313-317
Author(s):  
Rachael E. Pepin ◽  
Janet C. Cole
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Growth Regulator ◽  
Plant Growth Regulator ◽  
Plant Size ◽  
Plant Responses ◽  
Production Environments ◽  
Monarda Didyma

Summer and fall studies investigated the control of growth of bee balm (Monarda didyma ‘Marshall’s Delight’) by paclobutrazol, uniconazole, or flurprimidol applied to the substrate as a surface drench or through subirrigation. Flurprimidol and uniconazole were applied at 0, 0.5, 1.0, 1.5, or 2.0 ppm (0, 0.09, 0.18, 0.27, or 2.0 mg/pot), while paclobutrazol was applied at 0, 2, 4, 6, or 8 ppm (0, 0.6, 1.2, 1.8, or 2.4 mg/pot). Substrate drench applications were more effective than applications through subirrigation at reducing plant growth. Few trends in application concentrations within plant growth regulator occurred for the plant parameters measured. Based on inconsistent plant responses between the two studies and few differences among application concentrations, we do not recommend any of these plant growth regulators for controlling plant size of bee balm during production without further testing in production environments specific to bee balm.

AXILLARY SHOOT STIMULATION AND PLANT DEVELOPMENT OF COLEUS TREATED WITH CERTAIN PLANT GROWTH REGULATORS

1978 ◽  
Vol 58 (4) ◽  
pp. 971-976 ◽  
Author(s):  
M. KHOSH-KHUI ◽  
I. ROUHANI ◽  
B. SHAYBANY
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Plant Development ◽  
Indoleacetic Acid ◽  
Leaf Size ◽  
The Other ◽  
Axillary Shoot ◽  
Coleus Blumei ◽  
Number Of Branches

N6-benzyladenine (BA), indoleacetic acid (IAA) and 2-choroethylphosphonic acid (ethephon) were applied to pinched and non-pinched plants of four cultivars of coleus (Coleus blumei Benth). All growth regulators increased the number of branches of treated plants, with 800 ppm BA having the most prominent effect. Ethephon treatments dwarfed the plants and decreased leaf size, while BA and IAA enhanced these characters. Plants treated with ethephon developed more leaves in most of the cultivars, as compared with the other two growth regulators. BA-treated plants had lower, and IAA-treated plants had higher, shoot fresh and dry weights than controls.

scholarly journals Influencing Stock Production of Mojave Sage and Cape Daisy with the Application of Plant Growth Regulators

2021 ◽  
pp. 1-7
Author(s):  
Sean J. Markovic ◽  
James E. Klett
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Growth Index ◽  
Dry Weight ◽  
The Other ◽  
Plant Production ◽  
Stock Plant ◽  
Fresh Weight ◽  
Vegetative Cuttings

This study aimed to assess the effects of plant growth regulators (PGRs) on stock plant production of mojave sage (Salvia pachyphylla) and ‘Avalanche’ cape daisy (Osteospermum hybrid) that received foliar sprays of the following three PGRs: 200 and 400 ppm ethephon; 250 and 500 ppm benzyladenine; and 50 and 100 ppm gibberellic acid 4 and 7 (GA4+7) plus benzyladenine. Vegetative growth [height and width growth index (GI)], the number of vegetative cuttings, and fresh weight (FW) and dry weight (DW) of the harvested vegetative cuttings data were collected. A propagation study was conducted concurrently to determine the effects of the PGR treatments on rooting vegetative cuttings. GA4+7 plus benzyladenine (50 and 100 ppm) increased the production of both mojave sage and ‘Avalanche’ cape daisy cuttings by ≥18% more than the other treatments. The GI, FW, and DW results showed similar trends across experiments 1 and 2 for each perennial. In the propagation study, the rooting percentage did not differ after 4 weeks, indicating that the use of GA4+7 plus benzyladenine in production protocols could benefit producers of both perennials.

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