International Journal of Plant Breeding and Genetics

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 9 (5), pp. 001-003, May, 2022. © International Scholars Journals

Full Length Research Paper

Edaphic factors and survival of a red mangrove species (Rhizophora mangle) in two mangrove swamp soils

J. A. Onwugbuta-Enyi¹, B. A. Onuegbu² and K. Zuofa²

¹Department of Biology, Rivers State College of Education, P. M. B. 5047, Port Harcourt, Nigeria.

²Department of Crop/Soil Science and Forestry, Rivers State University of Science and Technology, P. M. B 5080, Port Harcourt, Nigeria.

Accepted 15 February, 2021

Abstract

The effects of two Niger Delta Mangrove Swamp Soils on growth and growth components of Rhizophora mangle were studied. The mud flats had higher manganese, organic carbon, lower sodium, higher phosphorus, lower pH and no sand particle compared with peaty clays. The mud flats also had very low cation exchange capacity (CEC) and these qualities affected adversely the plant height, survival, disease index and stability of the plants compared with those grown in peaty clays. Recommendations for improvement of the mud flats for mangrove swamp re-vegetation are made.

Key words: Red mangrove species, mangrove swamp soil, survival rate.

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 9 (5), pp. 001-007, May, 2022. © International Scholars Journals

Full Length Research Paper

Forest vegetation patterns along an altitudinal gradient in sub-alpine zone of west Himalaya, India

Sanjay Gairola¹*, R. S. Rawal¹ and N. P. Todaria²

¹G. B. Pant Institute of Himalayan Environment and Development, Kosi -Katarmal, Almora- 263 643, Uttarakhand, India

²Department of Forestry,HNB Garhwal University, Srinagar Garhwal Uttarakhand, India

Accepted 18 January, 2022

Abstract

The present study describes vegetation diversity along an altitudinal gradient in three sites of sub-alpine forests. The altitude of the study sites ranged from 2800 - 3600 m asl and represented a transition from closed canopy temperate forests to open canopy sub-alpine forests. The results revealed that from low to high altitude strata, size and density of trees decline sharply. The density of sapling and seedling do not follow the trend of trees and exhibit site/location specific trends. Shrub and herb also did not exhibit uniform patterns across altitudinal range of the sites. As sub-alpine forests are considered to be potentially prone to the adverse effects of climate change, present study will provide important baseline information for future evaluation of the impact of climate change on sub-alpine forest communities.

Key words: Diversity, timberline, altitude, west Himalaya.

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 9 (4), pp. 001-004, April, 2022. © International Scholars Journals

Full Length Research Paper

Molecular analysis and phenotype characterization of the progeny of two antisense potato plants

Olawole O. Obembe^1,2, Evert Jacobsen¹ and Richard G. F. Visser¹

¹Laboratory of Plant Breeding, Wageningen University, Box 386 6700AJ Wageningen, The Netherlands

²Present address: Department of Biological sciences Covenant University, P. M. B 1023 Ota, Ogun State, Nigeria.

Accepted 16 June, 2021

Abstract

Two transgenic potato lines csr2-1 and csr4-8, containing two different antisense constructs, csr2 and csr4, respectively, were crossed to investigate the possibility of achieving double transformants with combined effects of the two antisense transgenes on plant phenotypes and cellulose deposition. Molecular analysis revealed an expected segregation ratio of 1:1:1:1 of the four classes. Phenotype characterization revealed that offspring containing either one or both transgenes produced more tubers than the control plants but individual tubers were mostly smaller and had lesser weight than the control tubers.

Key words: Antisense technology, double transformants, genetic crossing, potato, segregation analysis.

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 8 (5), pp. 001-004, May, 2021. © International Scholars Journals

Full Length Research Paper

Epiphytic organisms on the pneumatophores of the mangrove Avicennia marina: occurrence and possible function

Y. Naidoo*, T. D. Steinke, F. D. Mann, A. Bhatt and S. Gairola

School of Biological and Conservation Sciences, University of KwaZulu- Natal, Westville Campus KZN, South Africa.

Accepted 18 October, 2020

Abstract

The nature of the epiphytism of red algae and also the occurrence and possible role of other epiphytic micro-organisms within the superficial tissues of pneumatophores of Avicennia marina (Forssk.) Vierh. were investigated. Transmission electron microscopy (TEM) studies revealed that bacteria and holdfasts of red algae were present in damaged tissue of the periderm. Culture studies indicated that some bacteria were diazotrophic. A mutualistic relationship between epiphytes and mangrove pneumatophores was postulated.

Keywords: Algae, bacteria, epiphytism, mangrove, Avicennia marina.

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 8 (5), pp. 001-004, May, 2021. © International Scholars Journals

Full Length Research Paper

Epiphytic organisms on the pneumatophores of the mangrove Avicennia marina: occurrence and possible function

Y. Naidoo*, T. D. Steinke, F. D. Mann, A. Bhatt and S. Gairola

School of Biological and Conservation Sciences, University of KwaZulu- Natal, Westville Campus KZN, South Africa.

Accepted 18 October, 2020

Abstract

The nature of the epiphytism of red algae and also the occurrence and possible role of other epiphytic micro-organisms within the superficial tissues of pneumatophores of Avicennia marina (Forssk.) Vierh. were investigated. Transmission electron microscopy (TEM) studies revealed that bacteria and holdfasts of red algae were present in damaged tissue of the periderm. Culture studies indicated that some bacteria were diazotrophic. A mutualistic relationship between epiphytes and mangrove pneumatophores was postulated.

Keywords: Algae, bacteria, epiphytism, mangrove, Avicennia marina.

International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 8 (1), pp. 001-006, January, 2021. © International Scholars Journals

Full Length Research Paper

Assessment of status and biomass of Swertia angustifolia : a high value Himalayan medicinal plant

Arvind Bhatt¹*, Anil K Bisht², R. S. Rawal² and Uppeandra Dhar²

¹School of Biological & Conservation Science, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa.

²Conservation of Biological Diversity Core, G. B. Pant Institute of Himalayan Environment and Development, Kosi-Katarmal, Almora 263 643 (UA), India.

Accepted 17 September 2020

Abstract

Studies on population assessment and biomass variation in selected populations of Swertia angus-tifolia were undertaken in west Himalaya. Low population density across the surveyed populations indi-cates poor availability of the species in study area. Species showed random distribution and higher fre-quency of occurrence in most of the population, which is the indicator of better potential of the spe-cies in these sites. Density was positively correlated with biomass. The biomass showed peak value in senescence phase and thus has positive consequences of harvesting for the survival of the species.

Key words: Endangered, conservation, Himalaya, Swertia angustifolia, medicinal plant.