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RISS 인기검색어
- 검색키워드
- 저자 : Hasenstein, Karl H. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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EFFECTS OF ABSCISIC ACID AND XANTHOXIN ON ELONGATION AND GRAVITROPISM IN PRIMARY ROOTS OF ZEA MAYS
LEE, JUNE S.,HASENSTEIN, KARL-HEINZ,MULKEY, TIMOTHY J.,YANG, RICK L.,EVANS, MICHAEL L. 이화여자대학교 생명과학연구소 1990 생명과학연구논문집 Vol.1 No.-
We examined the involvement of abscisic acid(ABA) and xanthoxin(Xan)in maize root gravitropism by(1) testing the ability of ABA to allow positive gravitropism in dar-grown seedling of the maize cultivar LG11, a cultivar known to require light for positive gravitropism of the primary root,(2) comparing survature in roots in which half of the cap had been excised and replaced with agar containing either ABA or indole-3-acetic acid(IAA),(3)measuring gravitropism in roots of seedings sub merged in oxygenated solutions of ABA or IAA and (4) testing the effect of Xan on root elongation. Using a variety of methods of applying ABA to the root, we found that ABA did not cause horizontally-oriented primary roots of dark-grown seedings to become positively gravitropic. Replacing half of the root cap of vertically oriented roots with an agar block containing ABA had little or no effect on curvature relative to that of controls in which the half cap was replaced by a plain agar block Replacement of the removed half cap with IAA either canceled or reversed the curvature displayed by controls. When light grown seedings were submerged in ABA they responded strongly to gravistimulation while those in IAA did not. Xan(up to 0.1mM)did not affect root elongation. The results indicate that ABA is not a likely mediator of root gravitropism and that the putative ABA precursor, Xan, lacks the appropriate growth-inhibition properties to serve as a mediator of root gravitropism.
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Park, Myoung Ryoul,Baek, So-Hyeon,de los Reyes, Benildo G.,Yun, Song Joong,Hasenstein, Karl H. Elsevier 2012 Journal of plant physiology Vol.169 No.2
<P><B>Abstract</B></P><P>Phosphorus (P) is a structural component of nucleic acids and phospholipids and plays important roles in plant growth and development. P accumulation was significantly reduced (about 35%) in rice leaves from plants grown under low (32μM) P compared to 320μMP grown plants. Genome response to low P was examined using the rice 60K oligonucleotide DNA microarrays. At the threshold significance of |log<SUB>2</SUB>| fold>2.0, 21,033 genes (about 33.7% of all genes on the microarray) were affected by P deficiency. Among all genes on the microarray, 4271 genes were sorted into 51 metabolic pathways. Low P affected 1494 (35.0%) genes and the largest category of genes was related to sucrose degradation to ethanol and lactate pathway. To survey the role of P in rice, 25 pathways were selected based on number of affected genes. Among these pathways, cytosolic glycolysis contained the least number of upregulated but most down-regulated genes. Low P decreased glucose, pyruvate and chlorophyll, and genes related to carbon metabolism and chlorophyllide <I>a</I> biosynthesis. However, sucrose and starch levels increased. These results indicate that P nutrition affects diverse metabolic pathways mostly related to glucose, pyruvate, sucrose, starch, and chlorophyll <I>a</I>.</P>
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Myoung Ryoul Park,So-Hyeon Baek,Benildo G. de los Reyes,Karl H. Hasenstein,Song Joong Yun 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Phosphorus (P) is an important structural component and plays critical roles in the process of energy transfer and signal transduction. Effect of low P on carbohydrate metabolism was investigated at the transcription level via transcriptome analysis using the rice 60K oligonucleotide DNA microarrays. Two-week-old rice seedlings were grown under a low (32 μM) or high (320 μM) P condition for two weeks and leaves from the seedlings were used for transcriptome analysis. Expression of genes involved in carbohydrate metabolic pathways (eg. glycolysis, sucrose degradation and starch synthesis and degradation) was most significantly affected under low P. Under low P, most genes involved in glycolysis were intensively down-regulated, genes of starch biosynthesis and degradation pathway were up- or down-regulated, and many genes involved in sucrose biosynthesis were intensively up-regulated. In leaves under low P, glucose and pyruvate levels decreased, but sucrose and starch levels increased. These results suggest that carbohydrate metabolism is adjusted primarily through comprehensive transcriptional modulation of genes involved in the carbohydrate metabolic super-pathway.
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