不同光质对辣椒幼苗生长特征的影响

Effects of Different Lights on Growth Characteristics of Pepper Seedlings

为了探究不同光质对辣椒幼苗生长发育的影响,在人工气候条件下研究了LED单质光对辣椒幼苗生长特性的影响。结果表明:红光处理后辣椒幼苗的叶绿素含量较低,但株高、鲜重、第一节间长度、完全伸展叶片的长度和宽度值均明显高于其他处理,到处理结束(处理后第18周)时红光处理的株高为121.35 mm,比紫光、蓝光和全光(CK)处理分别高44.70、51.72和53.66 mm,红光处理的叶片长度比紫光、蓝光和全光(CK)处理分别长18.64、17.16和13.05 mm,叶片宽度比紫光、蓝光和全光(CK)处理分别宽3.24、1.27和3.26 mm;而蓝光和紫光处理辣椒幼苗的节间较短、茎较粗、叶绿素含量较高,到处理结束时,紫光、蓝光和红光处理的辣椒幼苗第一节间长度分别为40.22、45.97和48.01 mm,紫光处理的茎粗为2.07 mm,比蓝光、CK(全光)和红光处理分别粗0.17、0.33和0.39 mm;相对于红光处理,蓝光和紫光处理的叶片栅栏组织排列较密且细胞较长,海绵组织较致密、胞间距较小;蓝光和紫光处理后根表皮和皮层细胞排列致密,中柱鞘、内皮层所占根横切面比例较大,茎的初生韧皮部分化较早,韧皮部和木质部所占比例较大,木质部和韧皮部增厚。因此,蓝光和紫光处理可以使辣椒幼苗生长健壮、根系发达,而红光处理可促进辣椒幼苗生长。

This study aimed to explore the effects of different LED light quality on the growth characteristics of pepper seedlings under artificial climatic conditions.Three different light treatments were used,and the growth indexes and tissue structure of pepper seedlings in a closed light plant culture darkbox in an artificial climate chamber were investigated with white light(full light) as CK.The results showed that chlorophyl content in the pepper seedlings treated with red light was relatively low,but the plant height,fresh weight,the first internode length,and the length and width of the fully unfloded leaves were obviously superior to those of the other treatments;by the end of treating(the 18th week after treatment),in red light treatment the plant height was 121.35 mm,respectively 44.70,51.72 and 53.66mm higher than in purple,blue and white light(CK) treatments,the leaf length was 18.64,17.16 and 13.05 mm longer,respectively,and the leaf width was 3.24,1.27 and 3.26 mm wider,respectively.The pepper seedlings treated with blue or purple light were relatively short in the first internode length,thick in the stem and high in the chlorophyl content.By the end of treating,the peper seedlings treated with purple,blue and red lights were respectively 40.22,45.97 and 48.01 mm in the first internode length.The purple light treatment was 2.07mm in the stem thickness,0.17,0.33 and 0.39 mm thicker than the blue,CK and red light treatments,respectively.In contrast to the red light treatment,of the blue and purple light treatments the leaf palisade tissue cells were long and arranged densely,the spongy tissues were dense and small in cell spacing;the cells of the root epidermis and cortex arranged densely,and the pericycle and endodermis accounted for a large proportion of root cross section;the primary phloem of the stem differentiated early,and the phloem and xylem thickened,accounting for a large proportion.Therefore,both blue and purple light treatments can make pepper seedlings robust and roots developed,while red light treatment can promote the growth of pepper seedlings.