Sunflower leaves

Gollan, T., Passioura, J.B. Munns, R. (1986). Soil water status affects the stomatal conductance of fully turgid wheat and sunflower leaves. Australian Journal of Plant Physiology, 13, 459-64. 

Lawlor, D.W. Fock, H. (1975). Photosynthesis, photorespiratory CO2 evolution of water stressed sunflower leaves. Planta, 126, 247-58. 

Extraction Procedure B. Figure 1 gives a flow diagram for this fractionation procedure, which was based on a modification of the simplified methods described by Serve et al. (20) and Hartley and Buchan (21). Two grams of ground dried sunflower leaves were added... 

Anjum T, Bajwa R (2005) A bioactive annuionone from sunflower leaves. Phytochem 66 1919-1921... 

Macias LA, Varela RM, Torres A, Mohnillo JMG (1993) Potential allelopathic guaianolides from cultivar sunflower leaves, var. SH-222. Phytochemistry 34 669-674 Macias LA, Molinillo JMG, Galindo JCG, Varela RM, Simonet AM, Castellano D (2001) The use of allelopathic studies in search for natural herbicides. J Crop Prod 4 237-256 Macias AL, Marin D, Oliveros-Bastidas A, Varela RM, Simonet AM, Carrera C, Molinillo JM (2003) Allelopathy as a new strategy for sustainable ecosystems development. Biol Sci Space 17 18-23... 

Spring, O, Bienert, U, Klemt, V. (1987). Sesquiterpene ladones in glandular tri-chomes of sunflower leaves. Plant Physiol., 130, 433-439. 

Phenolic accumulation in B-deficient tissues can activate a group of enzymes that use these compounds as substrates. In B-deficient sunflower leaves, PPO activity progressively augments as symptoms characteristic of this deficiency appear. Plants with sensitivity to B deficiency differ in PPO activity. The accumulation of phenolics and PPO activity are reportedly greater in more sensitive plants, such as sunflower, than in less deficiency-sensitive plants, such as com (Zea mays) [125]. 

Macias, F.A., Torres, A., Galindo, J.L.G., Varela, R., Alvarez, J,A., Molinillo, J.M.G Bioactive terpenoids from sunflower leaves cv. Peredovick (R). Phytochem 2002b 61 687-692. 

Heliannuol A (7) is the first heliannane reported in the literature.27 It was isolated from sunflower leaves and all the following members of the family have been isolated from the same source, but in different sunflower varieties. Surprisingly, no heliannuols have been isolated from other terrestrial sources so far. However, the basic heliannane skeleton (6) has been isolated lately from a marine organism, the Indo-Pacific sponge Haliclona fascigera.8 Heliannanes isolated from different sources are summarized in Table 5.1 and Figure 5.2 new heliannanes have been isolated from other sunflower varieties (unpublished results). 

D. 1996. Potential allelopathic sesquiterpene lactones from sunflower leaves. Phytochemistry A3, 1205-1215... 

Plants belonging to the family Asteraceae, including asters, daisies, and sunflowers, are rich sources of allelopathic sesquiterpenes and sesquiterpene lactones. Heliannuol A (19) and its related compounds heliannanes, found in sunflower leaves, are thought to be involved in the allelopathic effects displayed by the plants.8 Some sesquiterpene lactones such as dehydrocostuslactone (20), santamarine (21), and reynosin (22) have been shown to induce seed germination of root parasitic plants,9 especially of sunflower broomrape Orobanche cumana.10... 

Leaves with ragged holes. Cause Caterpillars. Caterpillars of all kinds find large sunflower leaves a tasty food suj y. A healthy plant can generally withstand an attack. Handpick pests, or spray leaves with BTK. 

Fluorescence transients calculated with the values of k3 = 20 10 and k4 = 5-10 (equivalent to I = 200 jxs) are similar to experimentally recorded curves in sunflower leaves (Fig.2). 

Fig. 1. (left) Influence of the pulse light intensity. Ip, on variable fluorescence, Fy, obtained from sunflower leaves. The numbers to the right indicate different levels of steady-state illumination in /imol photons m s . ... 

In a number of other types of growth studies (e.g. ref. 4,5), we had previously noted the tight coordination between growth and K accumulation in leaves, regardless of the limitation imposed to reduce growth. Figure 2b shows that K " accumulation in sunflower leaves was affected similarly to area expansion. With the possible exception of leaf 4 which showed a net loss of K " in the week following salinization to 1(X) mM, there was no indication of net K " redistribution in these studies. 

FIGURE. 1 Sunflower leaves were grown at two different light intensities (leaves L 400 jamol m " s", leaves H 1700 yumol-... 

An estimate of the carbon flux into cellulose could also be drawn based on an average value of net primary productivity (NPP) for crops, which can also be expressed on a leaf area basis. According to Leopold and Kriedemann (1975), a reasonable growth rate for sunflower leaves could be 85 g dry wt m week. For maize, an average NPP value calculated from results pubhshed by Uhart and Andrade (1995) resulted in 56 g dry wt m week". Averaging these two... 

Macias FA, Torres A, Galindo JLG, Varela RM, Alvarez JA, Molinillo JMG (2002) Bioactive terpenoids from sunflower leaves cv. Peredovick. Phytochemistry 61 687... 

Macias FA, Oliva RM, VarelaRM, Torres A, MolinUlo MG (1999) Allelochemictds from sunflower leaves cv. Peredovick Phytochem 52 613-621... 

Troitskaya, E. A., L. I. Dranik, and M. Ya. Shkol nik Phenol composition of sunflower leaves during boron deficiency. Fiziol. Rast. — Soviet Plant Physiol. 18, 393—396 (russ.), 328—330 (engl.) (1971). 

Sunflower leaves Evaluation of the potentiality of quali-tative/quantitative metallomics analysis with electrophoresis, SRXRF, and Kohonen neural network SR SDS-PAGE 53... 

Sunflower leaves Carbon dioxide Carbon dioxide+water Herbicide... 

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