Abstract
摘要：【目的】从解剖结构、钾养分积累及水势层面探究芽苗砧嫁接油茶苗期对缺钾响应的砧穗效应，为油茶钾素吸收利用调控及砧木选择利用提供理论指导。【方法】试验设置了施钾（K1：6 mmol/L）和缺钾处理（K0：0 mmol/L）两种钾水平处理，以同砧不同穗和同穗不同砧（赣8/赣无2、赣无1/赣无2、赣无2/赣无2、赣无2/赣8、赣无2/赣无1）的五个一年生油茶嫁接苗为试验材料进行盆栽试验，通过定期取样观察测定茎叶解剖结构、钾养分含量及水势，分析不同砧木或穗条的嫁接油茶对缺钾的响应差异。【结果】1）油茶苗期叶片各组织厚度对缺钾的响应不仅与穗条品种有关，同样受砧木品种的影响，赣8无论做砧木还是穗条，嫁接体叶片各组织均是不施钾时更厚，赣无1则是施钾情况下更厚；茎解剖结构对缺钾的响应与穗条品种关系更密切，缺钾利于赣8穗条组合茎和髓直径增粗，11月份时较K1处理分别大11.29%、47.70%，而另两个穗条组合则是缺钾处理明显较施钾处理小。2）缺钾整体影响嫁接苗茎、叶对钾养分的积累；对叶钾含量的影响程度由穗条品种决定，与砧木品种无关，赣8、赣无1穗条组合K0处理的叶钾含量较K1处理显著下降37.8%、30.7%，而赣无2穗条组合则K0与K1处理差异不明显。缺钾对茎钾含量的影响不仅与穗条有关，也因砧木不同而异。缺钾条件下赣无1砧木组合和穗条组合5月份茎钾含量分别较K1显著下降36.9%、40.7%，赣8和赣无2无论作砧木还是穗条嫁接，苗期茎钾含量受缺钾的影响均不显著。3）缺钾使各组合油茶苗的清晨水势增强，对正午水势的影响较小；穗条品种是决定油茶苗水分响应的核心，赣8穗条组合对缺钾更敏感，其清晨水势在5月和11月较K1明显更[收稿日期： 基金项目：国家自然科学基金“芽苗砧嫁接油茶钾营养效率的砧木效应及形成机制”（32060362）。NSFC ‘Effects of rootstock on potassium nutrition efficiency of nurse seed grafting Camellia Oleifera Abel and its formation mechanism’ 作者简介：曹市一（2001-），硕士生，orcid.org/0009-0004-1117-7845，E-mail：18879241248@163.com *通讯作者：胡冬南（1971-），博士，教授，orcid.org/0000-0003-2973-6436，E-mail：dnhu98@163.com] 高，增幅分别达67.86%和45.82%；砧木品种差异对缺钾的水势响应差异相对更小。【结论】油茶嫁接苗苗期对缺钾的响应存在砧、穗效应，叶片解剖结构、茎钾含量对缺钾的响应受穗条和砧木共同主导，叶片钾含量、茎解剖结构、水分生理（水势）的响应程度主要受穗条品种主导。建议油茶养分管理中既要关注穗条品种特性差异，同时也要重视嫁接砧木品种的影响。
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Claims 15
Claim · model-written summary
Under potassium omission, leaf tissues of grafts with 赣8 as either rootstock or scion were thicker.
CamelliaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8无论做砧木还是穗条，嫁接体叶片各组织均是不施钾时更厚”
t0“camellia seedlings”
Claim · model-written summary
Leaf tissues of grafts with 赣无1 were thicker with potassium applied.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣无1则是施钾情况下更厚”
t0“camellia seedlings”
Claim · model-written summary
For 赣8 scions, potassium deficiency increased stem diameter by 11.29% in November relative to K1.
- Material
- 赣8e0
- Organ / stage
- 茎e0
- Treatment
- 缺钾e0
- Outcome
- 茎和髓直径e0
- Direction
- 大e0
- Value
- 11.29%e0
- Qualifier
- 11月份e0
- Comparator
- K1处理e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“缺钾利于赣8穗条组合茎和髓直径增粗，11月份时较K1处理分别大11.29%、47.70%”
t0“camellia seedlings”
Claim · model-written summary
For 赣8 scions, potassium deficiency increased pith diameter by 47.70% in November relative to K1.
- Material
- 赣8e0
- Organ / stage
- 髓e0
- Treatment
- 缺钾e0
- Outcome
- 茎和髓直径e0
- Direction
- 大e0
- Value
- 47.70%e0
- Qualifier
- 11月份e0
- Comparator
- K1处理e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“缺钾利于赣8穗条组合茎和髓直径增粗，11月份时较K1处理分别大11.29%、47.70%”
t0“camellia seedlings”
Claim · model-written summary
The two other scion combinations had smaller stem and pith anatomy measures under potassium deficiency.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“而另两个穗条组合则是缺钾处理明显较施钾处理小”
t0“camellia seedlings”
Claim · model-written summary
K0 lowered leaf potassium content of 赣8 scion combinations by 37.8% relative to K1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8、赣无1穗条组合K0处理的叶钾含量较K1处理显著下降37.8%、30.7%”
t0“camellia seedlings”
Claim · model-written summary
K0 lowered leaf potassium content of 赣无1 scion combinations by 30.7% relative to K1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8、赣无1穗条组合K0处理的叶钾含量较K1处理显著下降37.8%、30.7%”
t0“camellia seedlings”
Claim · model-written summary
Leaf potassium content in 赣无2 scion combinations did not differ clearly between K0 and K1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣无2穗条组合则K0与K1处理差异不明显”
t0“camellia seedlings”
Claim · model-written summary
Under potassium deficiency, 赣无1 rootstock combinations had 36.9% lower stem potassium content in May than K1.
- Material
- 赣无1e0
- Organ / stage
- 茎e0
- Treatment
- 缺钾e0
- Outcome
- 茎钾含量e0
- Direction
- 下降e0
- Value
- 36.9%e0
- Qualifier
- 5月份e0
- Comparator
- K1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“缺钾条件下赣无1砧木组合和穗条组合5月份茎钾含量分别较K1显著下降36.9%、40.7%”
t0“camellia seedlings”
Claim · model-written summary
Under potassium deficiency, 赣无1 scion combinations had 40.7% lower stem potassium content in May than K1.
- Material
- 赣无1e0
- Organ / stage
- 茎e0
- Treatment
- 缺钾e0
- Outcome
- 茎钾含量e0
- Direction
- 下降e0
- Value
- 40.7%e0
- Qualifier
- 5月份e0
- Comparator
- K1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“缺钾条件下赣无1砧木组合和穗条组合5月份茎钾含量分别较K1显著下降36.9%、40.7%”
t0“camellia seedlings”
Claim · model-written summary
Stem potassium content was not significantly affected by deficiency when 赣8 or 赣无2 served as rootstock or scion.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8和赣无2无论作砧木还是穗条嫁接，苗期茎钾含量受缺钾的影响均不显著”
t0“camellia seedlings”
Claim · model-written summary
Potassium deficiency increased predawn water potential across graft combinations.
Not reportedComparator
Verbatim
e0“缺钾使各组合油茶苗的清晨水势增强”
t0“camellia seedlings”
Claim · model-written summary
Potassium deficiency had a smaller effect on midday water potential.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“对正午水势的影响较小”
t0“camellia seedlings in response to potassium deficiency”
Claim · model-written summary
Predawn water potential for 赣8 scions increased by 67.86% in May relative to K1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8穗条组合对缺钾更敏感，其清晨水势在5月和11月较K1明显更[收稿日期： 基金项目：国家自然科学基金“芽苗砧嫁接油茶钾营养效率的砧木效应及形成机制”（32060362）。NSFC ‘Effects of rootstock on potassium nutrition efficiency of nurse seed grafting Camellia Oleifera Abel and its formation mechanism’ 作者简介：曹市一（2001-），硕士生，orcid.org/0009-0004-1117-7845，E-mail：18879241248@163.com *通讯作者：胡冬南（1971-），博士，教授，orcid.org/0000-0003-2973-6436，E-mail：dnhu98@163.com] 高，增幅分别达67.86%和45.82%”
t0“camellia seedlings”
Claim · model-written summary
Predawn water potential for 赣8 scions increased by 45.82% in November relative to K1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“赣8穗条组合对缺钾更敏感，其清晨水势在5月和11月较K1明显更[收稿日期： 基金项目：国家自然科学基金“芽苗砧嫁接油茶钾营养效率的砧木效应及形成机制”（32060362）。NSFC ‘Effects of rootstock on potassium nutrition efficiency of nurse seed grafting Camellia Oleifera Abel and its formation mechanism’ 作者简介：曹市一（2001-），硕士生，orcid.org/0009-0004-1117-7845，E-mail：18879241248@163.com *通讯作者：胡冬南（1971-），博士，教授，orcid.org/0000-0003-2973-6436，E-mail：dnhu98@163.com] 高，增幅分别达67.86%和45.82%”
t0“camellia seedlings in response to potassium deficiency”