scholarly journals Effects of moisture stresses during vegetative and reproductive growth phases on productivity of six selected rain-fed rice varieties in Ifakara, Tanzania

2019 ◽  
Vol 14 (2) ◽  
pp. 54-64
Author(s):  
M. J. F. KITILU ◽  
A. M. S. NYOMORA ◽  
J. CHARLES
Keyword(s):  
Growth Phases ◽  
Reproductive Growth ◽  
Rice Varieties ◽  
Vegetative And Reproductive Growth

The carbon and nitrogen cost associated with the growth, reproductive and dormant phases of two South African semi-arid geophytic species of Gethyllis (Amaryllidaceae)

2013 ◽  
Vol 61 (7) ◽  
pp. 528 ◽  
Author(s):  
Christiaan Daniels ◽  
Wilfred Mabusela ◽  
Jeanine Marnewick ◽  
Alexander Valentine
Keyword(s):  
South African ◽  
Physiological Responses ◽  
Natural Habitat ◽  
Resource Utilisation ◽  
Growth Phases ◽  
Succulent Karoo ◽  
Reproductive Growth ◽  
Carbon And Nitrogen ◽  
Flower Production ◽  
Vegetative And Reproductive Growth

Gethyllis multifolia L.Bolus and G. villosa Thunb. (Family: Amaryllidaceae) are deciduous and bulbous geophytes that occur in the succulent Karoo biome of South Africa. Both species occupy the same natural habitat, but G. multifolia is threatened and G. villosa not. Both G. multifolia and G. villosa require seasonal bulb reserves for initial vegetative and reproductive growth. In spite of G. villosa having smaller bulbs than G. multifolia, both species produce similar flower sizes and weights. The aim of the present study was to determine the carbon and nitrogen costs of vegetative and reproductive growth during the phases of growth, senescence, reproduction and dormancy of these bulbous species. The rates, costs and efficiencies of biomass production during various growth phases of the two species were determined in a comparative experiment. The results show that in spite of a significantly smaller bulb, G. villosa produced more leaves per unit bulb mass and invested more carbon and nitrogen resources into the bulbs during senescence. G. villosa also had a higher flower production, relative to bulb weight, than did G. multifolia. These physiological responses suggest that G. villosa may be more efficient at carbon and nitrogen resource utilisation.

scholarly journals CANOPY MANIPULATION EFFECTS ON VEGETATIVE AND REPRODUCTIVE GROWTH OF “TITAN” RED RASPBERRY

HortScience ◽  
1993 ◽  
Vol 28 (4) ◽  
pp. 259E-259
Author(s):  
Gina E. Fernandez ◽  
Marvin P. Pritts
Keyword(s):  
Light Stress ◽  
Significant Negative Correlation ◽  
Growth And Yield ◽  
Growth Phases ◽  
Fruit Removal ◽  
Reproductive Growth ◽  
One Year ◽  
Vegetative And Reproductive Growth ◽  
High Yields ◽  
Source Sink

The objective of this experiment was to determine the effects that altering the probable source-sink relationships would have on subsequent growth and yield components under field conditions. The balance between vegetative and reproductive growth was altered by imposing light stress (shading) on various growth phases, or removing primocanes, floricanes or fruit. Removal of primocanes significantly increased yield the year of removal. However, if primocane removal coincided with canopy shading, this increase in yield was not achieved. Overall, a significant negative correlation existed between 1991 and 1992 yields. Treatments with high yields in 1991 had low yields in 1992, and visa verca. This evidence-suggests that: 1) primocanes and floricanes are competing for light, not photosynthates during the flowering and fruiting period and 2) altering the balance of vegetative and reproductive growth one year had a significant effect on growth the subsequent year.

scholarly journals Effects of Brassinosteroid on Vegetative and Reproductive Growth in Two Day-neutral Strawberries

1996 ◽  
Vol 65 (3) ◽  
pp. 651-654 ◽  
Author(s):  
Narongchai Pipattanawong ◽  
Nobuaki Fujishige ◽  
Kenji Yamane ◽  
Ryosuke Ogata
Keyword(s):  
Reproductive Growth ◽  
Vegetative And Reproductive Growth

scholarly journals Physiological and Agronomic Responses of Four Rice Varieties to Drought in the Rainforest

2018 ◽  
Vol 10 (2) ◽  
pp. 220-227 ◽  
Author(s):  
Mamadou FOFANA ◽  
Lekan Suleiman SAKARIYAWO ◽  
Mauton O. POPOGBE ◽  
Akeem A. OYEKANMI ◽  
Jamiu O. AZEEZ ◽  
...  
Keyword(s):  
Water Deficit ◽  
Growth Stage ◽  
Upland Rice ◽  
Water Status ◽  
Block Design ◽  
Physiological Mechanism ◽  
International Institute ◽  
Reproductive Growth ◽  
Rice Varieties ◽  
And Control

The present investigation tested the hypothesis that there would be variation in physiological responses to water deficit among rice varieties from different production ecologies, with contrasting tolerance to water deficit under repeated cycle of soil moisture deficit, at reproductive growth stage. A screen house and a field trial were conducted at International Institute of Tropical Agriculture, Ibadan and Ikenne (Latitude 6° 52' N, Longitude 3° 43' E) respectively. Both experiments had rice varieties (‘IR 64’, ‘WAB 56-104’, ‘IR 77298-1-2-B-10’ and ‘NERICA 4’) and stress status (stress and control) as treatment factor’s, arranged in a randomised complete block design with three replicates. In both trials, the physiological mechanism that underpins varietal differences with repeated cycles of water deficit at the reproductive growth stage was more balanced water status, improved foliar characters, efficient photosynthetic capacity and higher grain yield in comparatively drought tolerant upland rice varieties (‘NERICA 4’ and ‘WAB 56-104’), as opposed with the results for the drought susceptible cultivar ‘IR 64’. A converse pattern was observed on water stressed rice, despite fewer cycles of water deficit on the field. The results could have suggested that the initiation of water deficit is the rate limiting step rather than its intensity at the reproductive growth stage.    

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