CAJ | 학술논문

侧根是植物吸收利用土壤养分的重要器官,其生长发育受内部遗传因子和外部环境矿质养分的影响.通过琼脂分层培养发现:局部供应NO-3可以诱导水稻( Oryza sativa L.)主根或不定根上侧根的生长.为研究旱种条件下NO-3对水稻侧根发育及其N吸收的影响,设置了3个蛭石培养实验:分根处理、全株缺N、全株供N处理.分根处理(一半根系供应3 mmol/L KNO3,另一半根系供应3 mmol/L KCl)结果表明:局部供应NO-3 能够促进水稻侧根生长.而在全株处理下,N饥饿诱导了侧根的伸长.水稻根系对NO-3的这两种反应都存在着显著的基因型差异.同时对地上部N浓度、可溶性总糖含量及N含量分析表明,这些生理指标在分根处理与全株加N处理中的差异均不显著,表明分根处理也能基本满足植株正常生长对N的需求.在分根处理中,水稻的N含量与分根处理中供N一侧的平均侧根长度存在显著正相关,这表明在养分不均一的介质中,侧根长度对水稻N素吸收具有十分重要的作用.而在N素充足的条件下,两者之间的相关性并不显著,这暗示在养分充足的环境下,侧根长度可能并不是决定根系吸收N素的主要因素.
측근시식물흡수이용토양양분적중요기관,기생장발육수내부유전인자화외부배경광질양분적영향.통과경지분층배양발현:국부공응NO-3가이유도수도( Oryza sativa L.)주근혹불정근상측근적생장.위연구한충조건하NO-3대수도측근발육급기N흡수적영향,설치료3개질석배양실험:분근처리、전주결N、전주공N처리.분근처리(일반근계공응3 mmol/L KNO3,령일반근계공응3 mmol/L KCl)결과표명:국부공응NO-3 능구촉진수도측근생장.이재전주처리하,N기아유도료측근적신장.수도근계대NO-3적저량충반응도존재착현저적기인형차이.동시대지상부N농도、가용성총당함량급N함량분석표명,저사생리지표재분근처리여전주가N처리중적차이균불현저,표명분근처리야능기본만족식주정상생장대N적수구.재분근처리중,수도적N함량여분근처리중공N일측적평균측근장도존재현저정상관,저표명재양분불균일적개질중,측근장도대수도N소흡수구유십분중요적작용.이재N소충족적조건하,량자지간적상관성병불현저,저암시재양분충족적배경하,측근장도가능병불시결정근계흡수N소적주요인소.
Lateral root is primary organ for plant to explore and utilize soil nutrient efficiently.The development of lateral roots (LR) is controlled by both genetic factors and nutrient status in environment.To investigate the effects of nitrate (NO-3) on rice lateral root growth and nitrogen (N) uptake efficiency under upland condition,three treatments,including root-split culture and whole plant culture in N sufficient and deficient conditions,were used in a vermiculite culture experiment.Root-split treatment showed that the growth of lateral roots was stimulated by localized nitrate supply.However,in whole plant culture,elongation of lateral roots was induced by NO-3 deficiency.The effects of NO-3 on rice lateral root growth were genotype-dependent.Similar N concentration,soluble sugar concentration and N content in shoot were observed in both root-split treatment and whole plant culture under NO-3 sufficient condition,suggesting that the nitrogen requirement for rice normal growth could be satisfied with only half of roots supplied with NO-3.In the root-split treatment,N uptake was positively correlated with the average of lateral root length (ALRL) in NO-3-supplied side,suggesting that the ALRL is important for rice root N uptake in the environment where the nitrogen nutrient is limiting factor.No significant correlation was observed between N uptake and ALRL in whole plant culture under N sufficient condition,which implies that the length of lateral roots may not be the main factor to determine the rice root N uptake in nutrient-rich zone.Morphological and metabolic evidence in this study provided some prospects for genetic improvement of root system characters to improve the efficiency of nutrient absorption in rice.