Sexual Reproduction in Bryophytes in Relation to Physical Factors of the Environment
R. N. Chopra, Satish C. Bhatla in Bryophyte Development: Physiology and Biochemistry, 2019
It should be pointed out, however, that archegonial initiation in spring, at the beginning of the hot, dry summer, would not appear to be adaptive under Mediterranean conditions. Moreover, while British plants showed long-day stimulation of vegetative growth as well as archegonia induction,39 plants from Israel studied by Schwabe90 showed short-day stimulation of vegetative growth, which would promote development under relatively humid winter conditions, and became dormant under long days. These discrepancies suggest the occurrence of adaptive, genetic differentiation within Lunularia cruciata, and an investigation of the reproductive behavior of Mediterranean material would be of great interest. Confirmation of physiological differences between temperate and Mediterranean plants would favor the view that L. cruciata is native in temperate parts of Europe rather than a recent introduction from the Mediterranean region.
Horticultural Management of Syzygium cumini
K. N. Nair in The Genus Syzygium, 2017
An annual dose of about 20 kg of FYM during the prebearing period and 50–80 kg per tree at the bearing stage is considered beneficial (Bose et al. 2001). Lai and Lai (2000) reported the beneficial effect of jamun leaf litter in the soil. Sometimes in rich soils, the trees have a tendency to put on more vegetative growth, with the result that the fruiting is delayed. Under such conditions, the trees should not be manured and irrigation should also be given sparingly and withheld in September and October and again in February and March. This helps proper bud formation and blossoming and good fruit setting.
Cultivation of Riberry (Syzygium luehmannii)
Yasmina Sultanbawa, Fazal Sultanbawa in Australian Native Plants, 2017
As with water requirements, at the moment, little is known about the nutrient requirements of riberries. As experience with the crop accumulates, firmer guidelines and objective assessment techniques, such as leaf analyses, will come into common use. Until then, some general principles should be kept in mind when designing a fertiliser programme: Many Australian native plants are intolerant to high phosphorus levels, so a relatively low phosphorus fertiliser, suitable for natives, should be used.In the first season following establishment, the aim should be to maximise growth to develop a good plant structure and produce several flushes of next season’s fruiting wood. Therefore, frequent but relatively small fertiliser applications, particularly of nitrogen, potassium, phosphorus and trace elements, are desirable.Once established, restricting nutrient availability may be necessary to avoid excessive vegetative growth in spring and stimulate flowering. Therefore, it may be advisable to avoid or restrict fertiliser applications in spring.After harvest, vegetative growth, which will form next year’s fruiting wood, should be encouraged. A complete micronutrient foliar spray may be advisable in late winter/spring as flowers are being initiated.Experience has shown that trees benefit from applications of good-quality compost after fruiting has finished in February and in winter/early spring.
Induction of novel inflorescence traits in Chrysanthemum through 60Co gamma irradiation
Published in International Journal of Radiation Biology, 2020
Mohit Kumar Setia, Madhu Bala, Simrat Singh
The plant height measured at the time of bud appearance decreased significantly with subsequent increase in doses of γ-rays. This can be attributed to reduced rate of assimilation of photosynthates that affected the nutrition of plants (Went and Theimen 1937). Similar trend of reduction in plant height in Chrysanthemum was observed with exposure to γ-irradiation (Singh and Bala 2015). The Significant reduction in vegetative growth parameters were noticed in Chrysanthemum plants exposed at higher doses of γ-rays. The reduction in internodal length is attributed to decrease in plant height due to radiation-induced abnormal plant growth with potential effect on the inactivation of enzyme systems (Barron 1954) that influence the enzyme mediated photosynthetic pathways essential for growth and development of plants.
Assessment of natural variability in leaf morphological and physiological traits in maize inbreds and their related hybrids during early vegetative growth
Published in Egyptian Journal of Basic and Applied Sciences, 2019
Farag Ibraheem, Eman M. El-Ghareeb
Maize seeds contain proteins and starch as main food reserves [5,6]. Once germination signal (s) is perceived, critical physiological changes are initiated to mobilize seed reserves into metabolically active intermediates to support germination, seedling and early vegetative growth until the development of photosynthetically active leaves. During these stages, seed storage proteins provide the necessary nitrogen (N) for germination whereas starch is converted into metabolically active sugars. These seed-derived N and carbon resources gradually diminish as the germination progresses. Post-germination, roots actively absorbs N from soil either as inorganic or organic forms with nitrate being the most preferable N form for most plants [7,8]. The absorbed nitrate undergoes reduction then assimilation into various amino acids that support plant growth and development [9]. Within plants, N presents in different forms such as ammonia, nitrate, nitrite, proteins and many other nitrogenous compounds; however, amino acids represent the major form of cellular N [10]. More than 50% of the organic carbon can be shuttled into amino acid biosynthesis in some parts of plants [11]. Therefore, plants have to have a strict coordination between amino acid biosynthesis and carbon metabolism to maintain C/N balance in various tissues/organs at different growth stages under diverse environmental conditions [12,13].
Molecular and phytochemical assessment for some seedy strains of Alamar apricot rootstock under salinity stress
Published in Egyptian Journal of Basic and Applied Sciences, 2019
M. H. Abd El-Aziz, S. Y. Mohamed, Hadeer E. Magwaid
In conclusion, the molecular analysis of the tested seedy strains of Alamar apricot has revealed clear differences at the molecular level among these strains. Also, these differences were demonstrated by the performance of these strains under salinity stress conditions in terms of P5CS gene expression and accumulation of salinity tolerance-related metabolites. The latter were correlated with differences at the molecular level that detected by ISSR molecular marker technique. Where, the A3 strain was distinct in performance and number of ISSR unique molecular markers. So, it could be suggested that this strain could be utilized as a source of salinity tolerance-related genes in Alamar apricot rootstock. In addition, we recommend propagating this strain by vegetative growth (cuttings) to widespread in reclaimed lands and salt land up to 2000ppm.
Related Knowledge Centers
- Chimera
- Cloning
- Cellular Differentiation
- Cutting
- Artificial Reproduction
- Offspring
- Taraxacum
- Nucleic Acid Sequence
- Fruit
- Gene