LIBERATION OF GROWTH STIMULATING MATERIALS BY ROOTING SALIX CUTTINGS

1945 ◽  
Vol 23c (3) ◽  
pp. 85-93 ◽  
Author(s):  
N. H. Grace

Physiologically active substances were liberated by rooting willow cuttings and retained by the solution or sand media in which rooting had occurred. Subsequent rooting of willow cuttings in such media affected the number and particularly the length of roots. Stimulation of root growth on dormant cuttings occurred while the effects on non-dormant material were predominantly injurious. Stimulation or inhibition was related to the concentration of the liberated material. The active substance was thermostable and appeared to have effects similar to those of synthetic plant growth stimulants. It has been demonstrated that salicylates were not responsible for the activity.

2021 ◽  
Vol 244 ◽  
pp. 02021
Author(s):  
Shukhrat Abdualimov ◽  
Dilobar Rakhimova

Cotton growing is the main industry in Uzbekistan’s agriculture, and the country has accumulated a great deal of scientific and practical experience in cotton growing. A number of scientific studies is being undertaken in this regard. Especially in the cotton industry of the republic in recent years, the widespread use of physiologically active substances in the cultivation of fairy tales, high and quality crops has achieved positive results. Physiologically active substances are added to the soil, or the seed is applied to the seed before planting and can be used during the cotton growing season. We believe that the physiologically active substances used have a natural basis and their safety can play a special role in the cultivation of organic cotton. This article explores the potential for seed germination, cotton growth and development, and the cultivation of future, high-quality, environmentally friendly cotton when Tevevit Boms physiologically active substance is applied at a rate of 300-1,000 kg/ha during the preparation of the soil for planting without the use of chemical mineral fertilizers.


Russian vine ◽  
2021 ◽  
Vol 18 ◽  
pp. 11-15
Author(s):  
N.I. Zimina ◽  
◽  
S.I. Melnikova ◽  
O.I. Kolesnikova ◽  
◽  
...  

The purpose of the research was to identify growth stimulators that promote the activa-tion of growth processes and root formation, to improve the technology of growing high-quality own-rooted grape seedlings from shortened three-eyed cuttings. The influence of physiologically active substances (PAS): Epin, Silk, Kornevin, Nikfan, Kavkaz on sur-vival, activation of growth processes, root formation of shortened cuttings of Bianca grapes was determined. As a result of pro-cessing cuttings with PAS, the survival rate of cuttings in the nursery increased by 10.6–19.1 % relative to the control. The yield of seedlings of the variety in the experimental variants exceeded the control indicators by 2.8–18.4 %. The effect of preparations on plant growth was noted, the increase in one-year growth in the variants varied from 5.8 to 18.0 cm relative to the control. When the ba-sal part of the cuttings was briefly immersed in a 0.01 % solution of Nikfan, the growth length was 78.1 cm, when soaked in a 0.1 % solution of Kornevin – 76.8 cm, in a 0.1 % solution of Silk –75.5 cm, in the control this indicator was 60.1 cm. The positive effect of growth stimulants on the development of the root system has been established. The indica-tor of the average number of roots per own-rooted seedling for the variants varied from 10.5 to 12.5 pcs., in the control variant – 10.7 pcs. According to the complex of indi-cators, a variant with the treatment of the ba-sal part of the cuttings for 24 hours with the preparation Kornevin-0.1% was identified.


2021 ◽  
pp. 361-365
Author(s):  
Е.Ф. Гинда ◽  
В.Ф. Хлебников ◽  
Н.Н. Трескина

Изучено влияние физиологически активных веществ Гиббереллина, Циркона и Эпин-экстра на механический состав грозди, урожайность и содержание сахаров в соке ягод трех столовых сортов винограда в условиях Приднестровья. Определено влияние физиологически активных веществ на изменение массы грозди, количества ягод в грозди и урожайности в зависимости от метеорологических условий года. Установлено, что в более влажных условиях 2019 г. (ГТК = 1,0) увеличение массы грозди в опытных вариантах в сравнении с контрольными растениями составило на сорте Золотой Дон 24,5-43,5%; на сорте Велика - 48,4-81,0%. В менее влагообеспеченном 2020 г. (ГТК = 0,6) это превышение было на уровне - 53,3-110,3% и 17,7-41,7% соответственно. Увеличение массы грозди у сортов винограда в вариантах с обработкой регуляторами роста растений наблюдается преимущественно вследствие повышения количества ягод. Выявлено, что двукратная обработка растений физиологически активными веществами приводит к значительному снижению ягодного показателя и росту показателя строения грозди винограда. Оптимальным вариантом двукратной обработки растений сортов столового направления использованиия являются: для сорта Золотой Дон - Циркон, 0,6 мл/л; для сорта Велика - Эпин-экстра, 3,2 мл/л, в более увлажненных условиях 2019 г., что позволило повысить урожайность кустов на 46,7 и 81,1% соответственно. В засушливых условиях 2020 г. обработка сорта Золотой Дон препаратом Эпин-экстра в концентрации 3,2 мл/л и сорта Велика Цирконом, 0,6 мл/л, была наиболее эффективной, увеличив урожайность в 1,5-2,0 раза по сравнению с контролем. The effect of plant growth regulators Gibberellin, Zircon and Epin-extra on mechanical composition of the bunch, cropping capacity and sugar content in the juice of berries of three table grape varieties in the conditions of Pridnestrovie was studied. The influence of physiologically active substances on changes in the bunch weight, number of berries per bunch and cropping capacity depending on the meteorological conditions of the year was determined. It was found that in the more humid conditions of 2019 (HTC of 1.0), the bunch weight increase in experimental variants in comparison with the control plants was from 24.5% to 43.5% in ‘Zolotoy Don’ grape variety, and from 48.4% to 81.0% in ‘Velika’ grape variety. In the less moisture-rich 2020 (HTC of 0.6) this exceeding was at the level of 53.3%-110.3% and 17.7%-41.7%, respectively. An increase in the bunch weight of grape varieties treated with plant growth regulators is mainly observed due to an increase in the number of berries. It was found that two-fold treatment of plants with physiologically active substances leads to a significant decrease in the berry index and an increase in the index of grape bunch structure. The best variant for two-fold treatment of plants is Zircon, 0.6 ml/l, - for ‘Zolotoy Don’ variety; Epin-extra, 3.2 ml/l, - for ‘Velika’ grape variety in more humid conditions of 2019, resulting in the increase in cropping capacity of bushes by 46,7% and 81.1%, respectively. In the arid conditions of 2020, the treatment of ‘ Zolotoy Don’ variety with Epin-extra at a concentration of 3.2 ml/l and ‘Velika’ variety with Zircon, 0.6 ml/l, was the most effective, increasing the yield by 1.5-2.0 times compared to the control.


Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1223
Author(s):  
Jinhua Dong ◽  
Hiroshi Ueda

The detection of viruses, disease biomarkers, physiologically active substances, drugs, and chemicals is of great significance in many areas of our lives. Immunodetection technology is based on the specificity and affinity of antigen–antibody reactions. Compared with other analytical methods such as liquid chromatography coupled with mass spectrometry, which requires a large and expensive instrument, immunodetection has the advantages of simplicity and good selectivity and is thus widely used in disease diagnosis and food/environmental monitoring. Quenchbody (Q-body), a new type of fluorescent immunosensor, is an antibody fragment labeled with fluorescent dyes. When the Q-body binds to its antigen, the fluorescence intensity increases. The detection of antigens by changes in fluorescence intensity is simple, easy to operate, and highly sensitive. This review comprehensively discusses the principle, construction, application, and current progress related to Q-bodies.


2021 ◽  
Author(s):  
Simone F da Silva ◽  
Marcela T Miranda ◽  
Vladimir E Costa ◽  
Eduardo C Machado ◽  
Rafael V Ribeiro

Abstract Carbon allocation between source and sink organs determines plant growth and is influenced by environmental conditions. Under water deficit, plant growth is inhibited before photosynthesis and shoot growth tends to be more sensitive than root growth. However, the modulation of source-sink relationship by rootstocks remain unsolved in citrus trees under water deficit. Citrus plants grafted on Rangpur lime are drought tolerant, which may be related to a fine coordination of the source-sink relationship for maintaining root growth. Here, we followed 13C allocation and evaluated physiological responses and growth of Valencia orange trees grafted on three citrus rootstocks (Rangpur lime, Swingle citrumelo and Sunki mandarin) under water deficit. As compared to plants on Swingle and Sunki rootstocks, ones grafted on Rangpur lime showed higher stomatal sensitivity to the initial variation of water availability and less accumulation of non-structural carbohydrates in roots under water deficit. High 13C allocation found in Rangpur lime roots indicates this rootstock has high sink demand associated with high root growth under water deficit. Our data suggest that Rangpur lime rootstock used photoassimilates as sources of energy and carbon skeletons for growing under drought, which is likely related to increases in root respiration. Taken together, our data revealed that carbon supply by leaves and delivery to roots are critical for maintaining root growth and improving drought tolerance, with citrus rootstocks showing differential sink strength under water deficit.


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