| Effects of root exudates of maize and potato on potato growth |
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| DOI：10.7606/j.issn.1000-7601.2019.02.13 |
| Key Words: root secretion corn potato allelopathic effect pot experiments |
| Author Name | Affiliation | | ZI Shu-hui | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | WU Kai-xian | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | OUYANG Cheng-ren | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | FAN Zhi-wei | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | YANG You-qiong | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | ZHOU Feng | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | WU Bo-zhi | College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan 650201, China |
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| Abstract: |
| In this experiment, root exudates of donor maize and potato obtained by solution culture method were applied on potato plants in pot. Three treatments including potato applied with maize root exudates (P+M-RE), potato applied with potato root exudates (P+P-RE), and potato applied with water (CK) were carried out to evaluate potato growth. The results showed that: (1) The tuber biomass of potato treated with P+M-RE increased by 42.4% and 28.5%, 28.8% and 8.2% than that treated with P+P-RE and CK at the flowering and mature stages, respectively, while the tuber biomass of potato treated with P+P-RE reduced by 23.7% and 28.4% compared to that of CK at two stages, respectively. The difference was significant or extremely significant. (2) At the branching, flowering and mature stages, biomass of aboveground and underground with P+M-RE increased by 8.3%~12.7% and 7.5%~45.6%, while those in P+P-RE decreased by 1.7%~12.9% and 5.5%~20.9% compared to that of CK; the stem and leaf ratio in both two treatments were lower than that in CK, while the root and crown ratio increased by 64.1% and 42.5%, 56.8% and 40% than that in CK in the flowering and mature stages, respectively. (3) During the observation stage, the response index (RI)>0 in leaf, stem, root, and tuber of potato treated with P+M-RE, and the sensitivity ranked as root>leaf>tuber>stem, showing a promotion action; P+P-RE treated potato root had RI<0, while P+P-RE treated leaf and tuber had RI>0 at the branching and flowering stages, and RI<0 at mature stage, which showed a inhibition action. (4) At the flowering stage, dry matter mobilization efficiency (DMME) and contribution rate (DMCR) increased by 45.6% and 48.0% with P+M-RE, and increased by 30.7% and 43.9% with P+P-RE compared to that with CK. It is suggested that the root exudates of maize roots can promote the growth of the potato shoots, roots, and tubers, which are beneficial to the tuber expansion, while the root exudates of potato had an inhibitory effect on aboveground and underground growth that affects tuber expansion. Our results provide a theoretical basis for revealing the yield increasing mechanism in maize and potato intercropping system. |
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