scholarly journals Effects of endomycorrhizal development and light regimes on the growth of Dicorynia guianensis Amshoff seedlings

2000 ◽  
Vol 57 (7) ◽  
pp. 725-733 ◽  
Author(s):  
Mo�se Bereau ◽  
T�t� S�v�rien Barigah ◽  
Eliane Louisanna ◽  
Jean Garbaye
Keyword(s):  
Light Regimes ◽  
Dicorynia Guianensis

INFLUENCE OF WEEKLY CHANGES IN TEMPERATURE AND LIGHT REGIMES ON THE INCIDENCE OF BLOTCHY RIPENING OF TOMATOES

1974 ◽  
Vol 54 (1) ◽  
pp. 129-133
Author(s):  
T. MATSUMOTO ◽  
C. A. HORNBY
Keyword(s):  
Cumulative Effect ◽  
Controlled Environment ◽  
Diurnal Changes ◽  
Light Regimes ◽  
Common Trend ◽  
Cloudy Weather ◽  
Two Factors ◽  
Temperature Levels ◽  
Greenhouse Tomatoes ◽  
Compensatory Effect

The hypothesis that blotchy ripening (BR) of greenhouse tomatoes (Lycopersicon esculentum Mill.) was associated with a cumulative effect of alternating periods of bright sunshine and cloudy weather was tested in controlled environment chambers. Temperatures were programed to give diurnal changes between 11.7 C/26.7 C night/day representing sunny days, and 11.7 C/21.2 C night/day for cloudy days. The two levels of light were (1) 18,299 lx for sunny days, and (2) 16,656 lx for cloudy days. These two factors were combined in four regimes to represent (1) sunny-day temperature and light; (2) sunny-day temperature and alternate weeks of sunny-day and cloudy-day light; (3) alternate weeks of sunny-day and cloudy-day temperature and sunny-day light; and (4) alternate weeks of sunny-day temperature and light, and cloudy-day temperature and light. Four series of plants showed a common trend. Consistent sunny-day temperature and alternating weeks of sunny or cloudy-day light produced the highest incidence of BR. Alternating weeks of temperature levels with consistent sunny-day light produced less BR but not significantly so. When sunny-day temperature and light were alternated weekly with cloudy day conditions, there was a reduced percentage of BR and less severe symptoms. This regime suggests a compensatory effect when temperature is varied directly with changes in light intensity. The regime for consistent sunny-day temperature and light gave the lowest BR incidence with mild symptoms.

scholarly journals The effects of light regimes and hormones on corneal growth in vivo and in organ culture

2011 ◽  
Vol 219 (6) ◽  
pp. 766-775 ◽  
Author(s):  
Christina Wahl ◽  
Tong Li ◽  
Yuko Takagi ◽  
Howard Howland
Keyword(s):  
Organ Culture ◽  
Light Regimes

Dicorynamine and harmalan-N-oxide, two new β-carboline alkaloids from Dicorynia guianensis Amsh heartwood

2015 ◽  
Vol 12 ◽  
pp. 158-163 ◽  
Author(s):  
Jean-Baptiste Say Anouhe ◽  
Augustin Amissa Adima ◽  
Florence Bobelé Niamké ◽  
Didier Stien ◽  
Brise Kassi Amian ◽  
...  
Keyword(s):  
Dicorynia Guianensis

Do changes in light direction affect absorption profiles in leaves?

2010 ◽  
Vol 37 (5) ◽  
pp. 403 ◽  
Author(s):  
Craig R. Brodersen ◽  
Thomas C. Vogelmann
Keyword(s):  
Cross Sections ◽  
Incident Light ◽  
Monochromatic Light ◽  
Diffuse Light ◽  
Spongy Mesophyll ◽  
Light Regimes ◽  
Direct Light ◽  
Direct Measurements ◽  
Leaf Level

Leaf anatomy plays a functional role in propagating light through the leaf; palisade mesophyll has been shown to facilitate the channelling of collimated light deeper into the spongy mesophyll. Direct measurements of the propagation of diffuse light into the leaf, however, are absent. Using chlorophyll fluorescence imaging of leaf cross-sections, we measured light absorption profiles in leaves under direct (collimated), diffuse and low-angle monochromatic light. Low-angle and diffuse light was absorbed closer to the irradiated surface than direct light perpendicular to the surface. The shapes of internal absorption profiles indicated that leaves were influenced by the directional quality of the incident light. In addition, absorption profiles revealed that leaves were not simple light absorbing objects and that cellular anatomy influences the direction of light travelling into the mesophyll. These findings also suggest a mechanism for previously measured differences in leaf level photosynthesis under opposing light regimes.

Development of an algal treatment system for Se removal: Effects of light regimes, nutrients, sulfate and hypersalinity

Chemosphere ◽  
2016 ◽  
Vol 164 ◽  
pp. 372-378 ◽  
Author(s):  
Fang Liu ◽  
Jung-Chen Huang ◽  
Chuanqi Zhou ◽  
Shengbing He ◽  
Weili Zhou
Keyword(s):  
Treatment System ◽  
Light Regimes

Control of morphogenesis in the gametophyte of a fern by light and growth hormones

1980 ◽  
Vol 58 (13) ◽  
pp. 1464-1473 ◽  
Author(s):  
Piyush Swami ◽  
V. Raghavan
Keyword(s):  
Abscisic Acid ◽  
Blue Light ◽  
Red Light ◽  
Basal Medium ◽  
Cell Number ◽  
Growth Hormones ◽  
Dichlorophenoxyacetic Acid ◽  
Light Regimes ◽  
Lygodium Japonicum ◽  
2,4 Dichlorophenoxyacetic Acid

The effects of 2,4-dichlorophenoxyacetic acid (2,4-D), gibberellic acid (GA), and abscisic acid (ABA) on the morphogenesis of gametophytes of Lygodium japonicum growing as longer-than-broad biplanar plates in red light and as broader-than-long biplanar plates in blue light were studied. Addition of 2,4-D or GA to the medium induced a change in the form of gametophytes from biplanar to filamentous in red light. Gametophytes growing in a medium containing 2,4-D in blue light were longer than broad, very much like gametophytes growing in the basal medium in red light. Although ABA generally retarded the growth of gametophytes in both light regimes, its presence in a medium containing 2,4-D nullified the effect of the latter, causing gametophytes to become plate-like in red light and short and stunted in blue light. Changes in the morphology of gametophytes induced by growth hormones were accompanied by corresponding changes in their length:width ratio and cell number.

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