scholarly journals Ecological Studies on Vegetative Growth in Rice Plants : 1. On the leaf emergence interval

1966 ◽  
Vol 35 (3-4) ◽  
pp. 228-233 ◽  
Author(s):  
Mamoru NAGAI
Keyword(s):  
Vegetative Growth ◽  
Ecological Studies ◽  
Rice Plants ◽  
Leaf Emergence

Nitrogen supply controls vegetative growth, biomass and nitrogen allocation for grapevine (cv. Shiraz) grown in pots

2015 ◽  
Vol 42 (1) ◽  
pp. 105 ◽  
Author(s):  
Aurélie Metay ◽  
Jessica Magnier ◽  
Nicolas Guilpart ◽  
Angélique Christophe
Keyword(s):  
Vegetative Growth ◽  
Limiting Factor ◽  
Dependent Manner ◽  
Leaf Emergence ◽  
N Supply ◽  
Secondary Axis ◽  
Axis Elongation ◽  
Primary Axis ◽  
N Deficiency ◽  
Area Expansion

Maintaining grapevine productivity with limited inputs is crucial in Mediterranean areas. Apart from water, nitrogen (N) is also an important limiting factor in grape growing. The effects of N deficiency on grapevine growth were investigated in this study. Two-year-old Vitis vinifera L.cv. Shiraz plants grafted on 110 R were grown in pots placed outside and exposed to various N supplies (0, 0.6, 1.2, 2.4 and 12 g plant–1) under well-watered conditions. At veraison, plants were harvested and organs separately dried, weighed and analysed for N. During plant growth, the length of the primary and secondary axes and the number of leaves on them were recorded. The N content of leaves was also analysed at three phenological stages (flowering, bunch closure and veraison). All growth processes were inhibited by N deficiency in an intensity-dependent manner. Quantitative relationships with N supply were established. Vegetative growth responded negatively to N stress when comparing control N supply with no N supply: primary axis elongation (–61%), leaf emergence on the primary axis (–47%), leaf emergence on the secondary axis (–94%) and lamina area expansion (–45%). Significant differences on the plant N status were observed from flowering onwards which might be useful for managing fertilisation.

scholarly journals Ecological studies of diploid and autotetraploid rice plants.

1952 ◽  
Vol 1 (3) ◽  
pp. 156-160 ◽  
Author(s):  
Hideo KURIYAMA ◽  
Yoshio WATANABE
Keyword(s):  
Ecological Studies ◽  
Rice Plants ◽  
Autotetraploid Rice

scholarly journals Temperature and Irradiance Effects on Vegetative Growth of Two Species of Leucocoryne

2003 ◽  
Vol 128 (6) ◽  
pp. 815-820
Author(s):  
J.L. Catley
Keyword(s):  
Vegetative Growth ◽  
Low Temperatures ◽  
Controlled Environment ◽  
Plant Parts ◽  
Leaf Emergence ◽  
Mean Temperature ◽  
Made In

The influences of temperature and irradiance on vegetative growth of two species of Leucocoryne (Leucocoryne coquimbensis F. Phil and L. ixioides (Hook.) Lindl.) were examined in controlled environment growth rooms. The growing environments had day/night temperatures of 10/5, 15/10, or 20/15 °C, providing mean temperatures of 7.5, 12.5, or 17.5 °C, and photosynthetic photon fluxes (PPF) of 497 or 710 μmol·m-2·s-1. Leaf emergence data were recorded up to three times a week, and measurements of vegetative growth were made in the rooms twice weekly. Destructive harvests were carried out at intervals up to four weeks apart. Leaves of L. ixioides emerged first in all mean temperatures. As mean temperature decreased from 17.5 to 7.5 °C, the differences in first emergence dates became more apparent between species. Appearance of the second leaf of both species occurred in less than half the number of days the first leaf took to emerge. The time taken for further leaves to develop increased as temperature decreased, particularly for L. ixioides and at mean temperatures below 12.5 °C. Although leaves of L. ixioides emerged first, days to emergence of further leaves increased to lag behind production of L. coquimbensis leaves, particularly when mean temperatures dropped below 12.5 °C. Temperature also significantly affected growth of other plant parts. As mean temperature increased, maximum leaf, root and main bulb dry weights increased for both species, along with secondary bulb dry weights of L. coquimbensis. As irradiance increased, maximum leaf dry weights decreased and maximum bulb dry weights increased of both species, and maximum dropper dry weights of L. coquimbensis increased. Leucocoryne coquimbensis appears to have the greatest capacity to multiply vegetatively and this is enhanced by high mean temperatures. These results suggest that mean temperatures higher than those used in this study are required for sustained leaf emergence, particularly for L. ixioides although this species has the capacity to emerge at low temperatures. High mean temperatures are also likely to promote vegetative mass of all plant parts of both species, whereas higher irradiance levels than used in this study would enhance main bulb growth.

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