Effects of nutrients and light on growth and root formation in pisum sativum cuttings pdf

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effects of nutrients and light on growth and root formation in pisum sativum cuttings pdf

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Environmental influences on adventitious rooting in cuttings of non-woody species

DICK, R. The rooting of vegetatively propagated leafy cuttings involves the complex interaction of many processes. For this reason, the influence of carbohydrate status, nutrition, water and hormonal factors on root formation is poorly understood at a mechanistic level.

We present a mechanistic model of the growth of pre-formed root initials on a cutting consisting of leaf, internode and roots. The processes represented are leaf photosynthesis, starch mobilization, sugar transport, and sugar utilization for root growth. The model provides a quantitative scheme for understanding how root development depends on properties of cuttings such as leaf area, internode length and initial carbohydrate content.

The potential of the model to interpret rooting experiments on a whole-cutting basis is illustrated using published data for cuttings of Triplochiton scleroxylon a West African hardwood with different leaf areas. Observed rooting times are reproduced in the model by varying the leaf photosynthetic rate per unit area. The simulated starch and sugar dynamics during root growth are in qualitative agreement with observations.

A sensitivity analysis is performed to examine the effect of key parameters on the timing or success of rooting. The model provides a framework for examining the role of other factors known to affect rooting, such as nutrient and water status, but requires further parameterisation before it can be used as a predictive tool in vegetative propagation.

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Sign In or Create an Account. Sign In. Advanced Search. Search Menu. Skip Nav Destination Article Navigation. Close mobile search navigation Article Navigation. Volume Article Navigation. DICK , J. Institute of Terrestrial Ecology. Oxford Academic. Google Scholar. Cite Cite J. Select Format Select format.

Permissions Icon Permissions. Abstract The rooting of vegetatively propagated leafy cuttings involves the complex interaction of many processes. Model , carbohydrates , rooting , vegetative propagation. You do not currently have access to this article.

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Auxin regulates adventitious root formation in tomato cuttings

Adventitious root formation ARF is the process by which roots arise from nonroot plant tissue Bellini et al. Effectively using ARF for plant propagation is a cornerstone of the ornamental horticulture industry as it allows for plants with preferred traits to be propagated asexually and thereafter perpetuated indefinitely. The process by which excised stem sections develop adventitious roots can be divided into two distinct stages; cells of the existing tissue must first dedifferentiate, and then these cells must redifferentiate into root cells Hartmann et al. Calcium is crucial to ARF because it is required for root primordia formation, cell expansion, and cell division White and Broadley, Root formation is stimulated by Fe availability Giehl et al.

The environment which supports and facilitates rooting of cuttings has a profound influence on the success or failure of the establishment of a new plant. The purpose of this chapter is to assess the types of variation in environment that are important. The intention is to focus on the entire process of adventitious rooting i. These two marginal periods have all too often been neglected in the literature concerned with the effects of environmental conditions on adventitious rooting and the effects of various hormonal treatments on this process. Frequently there is a lack of concern for the environmental conditions of stock plants.

Cuttings obtained from 90 day old plants were submitted to four photoperiods 8, 12, 16 and 20 hours. After 60 days, allantoin content in roots and rhizomes was evaluated. The results showed that increases in photoperiod promoted an increment in the average content of allantoin in roots 0. On the other hand, in rhizomes, allantoin accumulation decreased 9. Plants cultivated under field conditions presented 2. Based on the fact that in comfrey the roots are considered to be sites of allantoin synthesis, the results demonstrated that photoperiod could influence both the synthesis of allantoin in these organs as well as its accumulation in the rhizomes.

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Environmental control of plant development View all 4 Articles. The geomagnetic field GMF is a natural component of our environment. Plants, which are known to sense different wavelengths of light, respond to gravity, react to touch and electrical signaling, cannot escape the effect of GMF.

Metrics details. Adventitious root AR formation is a critical developmental process in cutting propagation for the horticultural industry. While auxin has been shown to regulate this process, the exact mechanism and details preceding AR formation remain unclear. Even though AR and lateral root LR formation share common developmental processes, there are exist some differences that need to be closely examined at the cytological level.

DICK, R. The rooting of vegetatively propagated leafy cuttings involves the complex interaction of many processes.

Magnetic field effects on plant growth, development, and evolution

Adikari V. Interaction of gibberalic acid and Indole acetic acid on root formation in P Pisum sativum epicotyls cuttings. Planta, Ahkami A. Distribution of indole-3acetic acid in Petunia hybrida shoot tip cuttings and relationship between auxin transport, carbohydrate metabolism and adventitious root formation. Altman A. The effect of IAA on sugar accumulation and basipetal transport of C 14 labelled assimilates in relation to root formation in Phaseolus vulgaris cuttings.

In vascular plants , the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. The root's major functions are absorption of water and plant nutrition and anchoring of the plant body to the ground. Root morphology is divided into four zones: the root cap, the apical meristem, the elongation zone, and the hair. These root caps are sloughed off as the root goes deeper creating a slimy surface that provides lubricant.

Stock pea plants Pisum sativum L. The etiolation started the fifth day after sowing and lasted till cutting preparation. Endogenous IAA in the base of etiolated cuttings was higher during the first 24 h after cutting preparation than in the control. Ethylene was increased 24 h after cutting preparation and the increase was greater from partially etiolated cuttings. The results showed that besides IAA and cytokinins, which played a role in the rooting of cuttings, sucrose influenced rooting in the case of fully etiolated stock plants. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve.

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Они рисовали на разграфленных листах какие-то символы, вглядывались в компьютерные распечатки и постоянно обращались к тексту, точнее - нагромождению букв и цифр, на экране под потолком, 5jHALSFNHKHHHFAF0HHlFGAFFj37WE fiUY0IHQ434JTPWFIAJER0cltfU4. JR4Gl) В конце концов один из них объяснил Беккеру то, что тот уже и сам понял. Эта абракадабра представляла собой зашифрованный текст: за группами букв и цифр прятались слова. Задача дешифровщиков состояла в том, чтобы, изучив его, получить оригинальный, или так называемый открытый, текст. АНБ пригласило Беккера, потому что имелось подозрение, что оригинал был написан на мандаринском диалекте китайского языка, и ему предстояло переводить иероглифы по мере их дешифровки. В течение двух часов Беккер переводил бесконечный поток китайских иероглифов.

Ну, понимаешь, он криптограф. Они все, как один, - эгоцентристы и маньяки. Если им что нужно, то обязательно еще вчера. Каждый затраханный файл может спасти мир. - И что же из этого следует.

Беккер отчаянно давил на тормоз, но покрышки потеряли всякое сцепление с полом.

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