Relative Kinetics of Chlorogenic and Caffeic Acids During the Onset of Boron Deficiency in Sunflower

Abstract

-\ characteristic lesion, indicative of )oron dleficiencv in plants, is the appearance of necrotic areas in wvhich a blue-white finiorescenice may oftenl be note (d (3). In the stinflower. the filuorescenlce has l)een shown to restilt primarilv from CA2 and CG.\ acids (2). The latter were estimatedl to l)e as high a-s I () times niorimial valuies in the greeni areas contigtnotus With the necrotic. As it is conceival)le that the necrosis itself restilts fromil excess phenolic acids. we have (leterilinled the overall changes (i.e., withouit regard to turnover) inl plalnts made boron--leficienit in the growinig leaves and(I the growing p)oint. 2) for young, expanding leaves and(l for the growilng points were dleterminie(l fromil the dlata of tables) 1 and 2, respectively. E'achi vadtle rel)resents thle average Of a replication of 2 plants grown in the same p)ot. All )lansL were fromi lalpopation germlinate(l and miade horon-deficient (where al)l)lical)le) siminiltaneoislv. 'I'lhC ratios shoxx n in the figures have an exl)erimelltal ei-ror of + 9 %.

Influence of boron concentrations on some meta‐bolites of date palm and sorghum seedlings

“…2) in other plant species when B deficient (13,21,42). These results also are reflected in the activity of polyphenol oxidase (Fig.…”

“…Therefore, it was argued that a B deficiency favored the pentose phosphate pathway which would result in the accumulation of phenolic compounds (21). Indeed, some have indicated the accumulation of certain phenolic and flavonoid compounds in the tissue due to B deficiency (5,9,13,29,41,42).…”

Evaluation of sulfur and foliar application of Zn and Fe on yield and biochemical factors of cumin (Cuminum cyminum L.) under irrigation regimes

“…The positive effect of Zn has been previously reported on total phenolic contents (48,49). Authors have suggested that this increase is resulted from increased expression of responsible genes for biosynthesis of phenolic compounds (50). Total phenol content increased with the application of sulfur fertilizer.…”

Boron

“…resulted in an induced fluorescence ofthe stem tissue, a response that Spurr (1952) suggested was due to an increased level of caffeic and chlorogenic acids. Others (Dear and Aronoff, 1965) suggested that the increase in caffeic acid caused tissue necrosis; caffeic acid or its metabolite caused a breakdown of conductive tissue in the plant, bringing about death of the tissue. Others have also observed the accumulation of fluorescent products, presumably phenols, in boron-deficient plants (Watanabe et at., 1961(Watanabe et at., , 1964Shkol'nik, 1974;Rajaratnam and Lowry, 1974).…”