scholarly journals Seasonal flowering and evolution: the heritage from Charles Darwin

2009 ◽  
Vol 36 (12) ◽  
pp. 1027 ◽  
Author(s):  
R. W. King ◽  
O. M. Heide
Keyword(s):  
Light Intensity ◽  
Flowering Time ◽  
Seasonal Changes ◽  
Charles Darwin ◽  
Natural Light ◽  
Essential Component ◽  
Molecular Approaches ◽  
Insect Pollinators ◽  
Seasonal Flowering

To survive, plants optimise their seasonal flowering time and set seed to avoid extremes of the environment including frost, heat and drought. Additionally, pollination may need to be tightly regulated in time so that it coincides with flowering of other individuals and/or with the presence of bird or insect pollinators. It is now clear that plants use seasonal changes in natural light intensity, daylight duration and temperature to achieve reproducible timing of flowering year-in-year-out. In more recent studies, genetic and molecular approaches are beginning to provide a basis for understanding heritability, an essential component of Darwin’s concept of evolution.

scholarly journals Integration of seasonal flowering time responses in temperate cereals

2008 ◽  
Vol 3 (8) ◽  
pp. 601-602 ◽  
Author(s):  
Megan N. Hemming ◽  
W. James Peacock ◽  
Elizabeth S. Dennis ◽  
Ben Trevaskis
Keyword(s):  
Flowering Time ◽  
Seasonal Flowering

scholarly journals PERANAN TUMBUHAN LIAR DALAM KONSERVASI SERANGGA PENYERBUK ORDO HYMENOPTERA

2016 ◽  
Vol 10 (2) ◽  
pp. 195
Author(s):  
Erniwati Erniwati ◽  
Sih Kahono
Keyword(s):  
Flowering Time ◽  
Food Resources ◽  
Wild Plants ◽  
Cultivated Plants ◽  
Applied Study ◽  
Insect Pollinators ◽  
Cultivated Plant ◽  
Dry Seasons

The role of the wild plants in relation to the conservation of the Indonesian insectpollinators was studied at several areas of Java. Three of direct observationmethods were applied: study of biodiversity and observation on the wild flowersand the insect pollinators as well, and the behaviour of the insects. The flowersof wild plants were relatively smaller and paler in colour, however they were moreattractive to insect pollinators than cultivated plants. Flowering time of the wildplants was mostly during wet seasons, contrary to that of the cultivated plantswhich was mostly during dry seasons. Our observation indicated that these wildplants are the food resources of insect pollinators during wet seasons. Observationdata support the importance of wild plants to supply food to insect pollinatorsduring wet seasons. Management of wild and cultivated plant environments isnecessary to conserve insect pollinators.

scholarly journals POLA PEMANGSAAN LARVA IKAN KAKAP MERAH, Lutjanus sebae

2016 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Regina Melianawati ◽  
Philip Teguh Imanto ◽  
Made Suastika
Keyword(s):  
Light Intensity ◽  
Feeding Activity ◽  
Feeding Pattern ◽  
Natural Light ◽  
Digestion Time ◽  
Digestion Rate ◽  
Minimum Light ◽  
Intensity Condition

Penelitian ini bertujuan untuk mengetahui pola pemangsaan dari larva ikan kakap merah, L. sebae umur 5 dan 10 hari yang dipelihara dengan kondisi pencahayaan alami. Pengambilan sampel dilakukan setiap satu jam pada masing-masing umur tersebut. Hasil pengamatan menunjukkan bahwa secara alami pola pemangsaan larva L. sebae tergantung pada kondisi pencahayaan, di mana aktivitas pemangsaan berlangsung secara maksimal pada saat tersedia pencahayaan dengan intensitas yang mencukupi untuk larva menangkap mangsanya. Intensitas cahaya minimal yang diperlukan oleh larva L. sebae untuk melakukan pemangsaan berada pada kisaran 400—600 lux. Maksimal pemangsaan satu larva pada umur 5 dan 10 hari adalah 6,2 dan 25,3 individu rotifer. Lama waktu pencernaan larva umur 5 dan 10 hari adalah 4 dan 5 jam, sedangkan laju cerna larva pada masing-masing umur tersebut adalah 1,50 dan 2,76 individu rotifer per jam.The aim of this research was to get the information about the feeding pattern of emperor snapper L. sebae larvae at 5 and 10 days olds reared under natural light intensity. Larvae samples were taken every hour from each age. The result showed that naturally, feeding pattern of emperor snapper larvae depend on the light intensity condition, feeding activity would be done when the light intensity was enough available for supporting larvae to feed. Minimum light intensity that needed by the larvae for feeding activity was range between 400—600 lux. Maximum feeding per larvae at 5 and 10 days olds were 6.2 and 25.3 individual rotifers. Digestion time of larvae at those ages was 4 and 5 hours, while digestion rate were 1.50 and 2.76 individual rotifers per hour.

Impact of light intensity on flowering time and plant quality ofAntirrhinum majus L. cultivar Chimes White

2004 ◽  
Vol 5 (4) ◽  
pp. 400-405 ◽  
Author(s):  
Muhammad Munir ◽  
Muhammad Jamil ◽  
Jalal-ud-din Baloch ◽  
Khalid Rehman Khattak
Keyword(s):  
Light Intensity ◽  
Flowering Time ◽  
Plant Quality

Physiological and ecological studies on the oestrogenic isoflavones in subterranean clover (T. subterraneum L.) III. Effects of light

1967 ◽  
Vol 18 (1) ◽  
pp. 23 ◽  
Author(s):  
RC Rossiter ◽  
AB Beck
Keyword(s):  
Light Intensity ◽  
Subterranean Clover ◽  
Substantial Effect ◽  
The Other ◽  
Light Environment ◽  
Natural Light ◽  
Ecological Studies ◽  
Other Hand ◽  
Isoflavone Content ◽  
Per Se

Isoflavone levels in subterranean clover leaves were higher in 13 hr days of natural daylight than in 6 hr days, but length of photoperiod per se had no substantial effect on these levels. In the field, reduction of light intensity (by shading) to 40% daylight caused no decline in isoflavone levels compared with full daylight; even at 24% daylight the reduction in levels was ill defined. On the other hand, in young seedlings there was a marked fall in isoflavone content, especially in the unifoliate leaf, as light intensity fell from 950 to 320 f.c. However, appreciable isoflavone formation was found in dark-grown clover seedlings. Possible light reactions connected with the promotion of isoflavone synthesis are discussed. Changes in isoflavone levels resulting from variation in the natural light environment are unlikely to be sufficient to affect "clover disease".

scholarly journals Light conditions alter accumulation of long chain polyprenols in leaves of trees and shrubs throughout the vegetation season.

2005 ◽  
Vol 52 (1) ◽  
pp. 233-241 ◽  
Author(s):  
Agnieszka Bajda ◽  
Tadeusz Chojnacki ◽  
Józefina Hertel ◽  
Ewa Swiezewska ◽  
Jacek Wójcik ◽  
...  
Keyword(s):  
Light Intensity ◽  
Seasonal Changes ◽  
Leaf Blade ◽  
Early Summer ◽  
Light Conditions ◽  
Natural Habitats ◽  
Vegetation Season ◽  
The Difference ◽  
Trees And Shrubs ◽  
Long Chain

In many plants belonging to angiosperms and gymnosperms the accumulation in leaves of long chain polyprenols and polyprenyl esters during growth in natural habitats depends on the light intensity. The amount of polyprenols in leaves is also positively correlated with the thickness of the leaf blade (SLA, specific leaf area). The polyprenol content of leaves shows seasonal changes with a maximum in autumn and a minimum in early summer with the difference between poorly and well illuminated plants persisting throughout the vegetation season.

scholarly journals Vernalization Duration and Light Intensity Influence Flowering of Three Hybrid Nobile Dendrobium Cultivars

HortScience ◽  
2011 ◽  
Vol 46 (3) ◽  
pp. 406-410 ◽  
Author(s):  
Min Lin ◽  
Terri W. Starman ◽  
Yin-Tung Wang ◽  
Genhua Niu
Keyword(s):  
Light Intensity ◽  
Flowering Time ◽  
Photon Flux ◽  
Flower Initiation ◽  
Flower Longevity ◽  
Photosynthetic Photon Flux ◽  
Flower Diameter ◽  
Flower Quality ◽  
Delayed Flowering

The flowering time and flower quality of three hybrid Dendrobium nobile cultivars in relation to light intensity during cooling and duration of vernalization were studied in the first experiment. Mature Dendrobium Red Emperor ‘Prince’, Den. Sea Mary ‘Snow King’, and Den. Love Memory ‘Fizz’ plants were vernalized at 10 °C under 300 to 350 μmol·m−2·s−1 photosynthetic photon flux (PPF) (12-h photoperiod) or darkness, each with four cooling durations (2, 4, 6, or 8 weeks). Plants were forced in a greenhouse after vernalization. At least 4 weeks of 10 °C cooling in light was needed for complete flower initiation of Den. Red Emperor ‘Prince’, whereas Den. Sea Mary ‘Snow King’ and Den. Love Memory ‘Fizz’ only needed 2 weeks of 10 °C cooling regardless of light. For all three cultivars, darkness during vernalization slightly delayed flowering and resulted in fewer but larger flowers. Longer cooling duration delayed flowering, decreased flower longevity, and produced more and larger flowers. In a second experiment, Den. Love Memory ‘Fizz’ plants were vernalized at 15 °C for 4 weeks under a 12-h photoperiod and PPF of 0, 50, 100, or 200 μmol·m−2·s−1. Compared with 200 μmol·m−2·s−1, low PPF at 50 or 100 μmol·m−2·s−1 did not affect flowering time or flower qualities; however, darkness delayed flowering and reduced flower qualities except flower diameter.

Sign in / Sign up

Export Citation Format

Share Document