壳寡糖浸种对马铃薯微型薯芽生长和内源激素含量的影响

doi:10.3864/j.issn.0578-1752.2023.04.016

Abstract

Abstract:

【Objective】 Seed soaking treatment is commonly used in potato production to promote tuber germination and bud growth. However, the improper use of seed soaking agents can trigger an imbalance of endogenous plant hormone levels, leading to the emergence of potato high-legged seedlings. In this study, the immersion effects on the growth and endogenous hormone content of potato minitubers were studied, so as to provide a theoretical basis for the safe use of chitooligosaccharide as a seed dressing agent for potato minituber. 【Method】The minitubers of Favorita were soaked with chitooligosaccharide solution at different concentrations of 10, 50, and 200 mg∙L^-1 (w/v), respectively, and the most effective concentration for promoting bud growth was screened. Seeds treated with 50 mg∙L^-1 (w/v) chitooligosaccharide for 15 min was the treatment group (COS₅₀), and the negative and positive control groups were treated with distilled water (Con) and 15 mg∙L^-1 gibberellin (GA₃), respectively. The germination rate, germination energy, bud length and bud diameter of tubers after seed soaking treatment were determined. The content of endogenous hormones in bud tissue was analyzed by ELISA before treatment (BT), before germination stage (BGS), germination stage (GS), and vigorous growth period (VG), respectively, and the morphology of terminal bud cells of GS was observed by paraffin section staining. Pearson correlation analysis was used to determine the intrinsic differences between shoot growth and endogenous hormone content. 【Result】Seed soaking with 50 mg∙L^-1 (w/v) chitooligosaccharide effectively promoted the germination and growth of tuber buds of the potato minitubers. The bud length and bud diameter of the treated samples were significantly higher than that of Con group (74.7%) and GA₃ group (37.2%). On the 5th day after soaking, the tuber germination rate reached 100%, which was 40.0% and 17.0% higher than the negative and the positive control, respectively. The germination energy of the minitubers was significantly enhanced. On the 5th day after treatment, the germination energy of minituber increased by 80.0% and 28.6% compared with Con and GA₃ groups, respectively. Different seed soaking treatments also showed significant differences in the endogenous hormone contents in the terminal bud meristem of minitubers. Compared with the negative control, COS₅₀ treatment elevated the levels of auxin, cytokinin, and gibberellin in the tubers during VG period, and the contents of these hormone increased by 11.4%, 2.7%, and 2.5%, respectively, while the content of abscisic acid decreased by 3.2% (P<0.05). The positive control treatment promoted the highest levels of endogenous gibberellin, cytokinin and auxin, and COS₅₀ treatment group had significantly lower levels of auxin, cytokinin and gibberellin than the positive control group by 5.1%, 8.4%, and 2.0%, respectively (P<0.05). No significant reduction was observed in the level of abscisic acid. However, the contents of endogenous polyamines in the apical bud meristems of the minitubers treated with COS₅₀ was 7.0% and 2.8% higher than those in the Con and GA₃ treatment groups, respectively. The results of paraffin section staining revealed that the morphological differences between the minitubers terminal bud cells was attributed to the different seed soaking treatments. The cells of the terminal bud meristem expanded resulting in elongated and flat shape in GA₃ treatment, while the cells of COS₅₀ treatment group showed a uniform shape, similar to the negative control. Furthermore, the sprouts growth, sprouts diameter, germination rate and energy of minitubers were positively correlated with the increase of cytokinin, gibberellin and polyamines contents induced by COS₅₀ treatment (P<0.05), while abscisic acid and ployamines content were significantly negatively correlated (r=-0.785, P<0.01). 【Conclusion】Seed soaking with chitooligosaccharide increased the contents of auxin, cytokinin, gibberellin, and polyamines in sprouts of minitubers. The treatment also increased the germination rate, sprouts length and sprouts diameter of potato minitubers. Uniform enlargement of meristematic cells in the sprouts of minitubers observation showed that COS₅₀ treatment did not affect the longitudinal elongation of apical bud meristematic cells during the expansion process, causing the bud to grow wildly. However, gibberellin content decreased significantly in seed soaked with 50 mg∙L^-1 (w/v) chitooligosaccharide compared with the treatment with exogenous gibberellin 3.

Key words: chitooligosaccharide, minitubers of potato, seed soaking, germination, endogenous hormones

YE Nan, ZHU Yan, ZHAO YuanShou, ZHU JianNing, MEN JiaWei, CHEN Fu, KONG DeYuan, ZHANG WeiBing, ZONG YuanYuan, LI YongCai. Effects of Seed Soaking with Chitooligosaccharide on the Growth of Sprout and Endogenous Phytohormone Content in Potato Minitubers[J].Scientia Agricultura Sinica, 2023, 56(4): 788-800.

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相关性 Correlation	芽长 Bud length	芽直径 Bud diameter	发芽势 Germination energy	发芽率 Germination rate	GA	ABA	IAA	PA	CTK
芽长 Bud length	1.00	0.729**	0.911**	0.827**	0.906**	0.046	-0.158	0.674*	0.935**
芽直径 Bud diameter		1.00	0.384*	0.651**	0.577*	0.369	-0.278	0.491*	0.702**
发芽势 Germination energy			1.00	0.764**	0.451*	-0.26	-.384*	0.420*	0.626**
发芽率 Germination rate				1.00	0.775**	0.13	-.524*	0.591*	0.823**
GA					1.00	-0.303	-0.229	0.571*	0.903**
ABA						1.00	-0.146	-0.785**	-0.097
IAA							1.00	-0.316	-0.239
PA								1.00	0.352
CTK									1.00

Effects of Seed Soaking with Chitooligosaccharide on the Growth of Sprout and Endogenous Phytohormone Content in Potato Minitubers

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