Coordination of root growth and leaf senescence in cotton

Wang, Sufang; Zhang, Zhiyong; Tang, Jian; Xue, Hui-Yun

doi:10.3724/sp.j.1006.2020.94043

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Local agriculture in the Daming area is intensified in pollen zone 4, which is inferred from the significant increase of Malvaceae. A strong correlation between cotton and Malvaceae has been observed in the field of botanical research (Wang and Li, 1994). Malvaceae increased to its peak value between 285-215 cm (Figures 3, 6B), suggesting that widespread cotton cultivation probably appeared since ca.…”

Section: Implications For Pollen-based Anthropogenic Impactsmentioning

confidence: 60%

Holocene flood records and human impacts implied from the pollen evidence in the Daming area, North China Plain

Yang,

Liu,

Roberts

et al. 2024

Front. Earth Sci.

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Understanding the environmental significance of pollen and spores in alluvial plains is important for stratigraphic correlation and paleoenvironmental reconstruction. This paper presents palynological data from the North China Plain and explores their relationship with paleoflood records and human impacts since the Holocene. Our data reveal that pollen concentration and pollen assemblage vary in flood deposits (including overbank deposits and slackwater deposits) and inter-flood deposits (including sandy soils and lacustrine deposits). Flood deposits have higher fern percentages (28.6%) and lower herbaceous percentages (14.8%) compared to inter-flood deposits, though slackwater deposits share similar pollen concentrations and assemblages with sandy soils. Notably, overbank deposits are characterized by pollen-poor zones and aggregation of deteriorated pollen grains, especially in Unit III (755–385 cm, ca. 3.2–2.2 ka) and Unit V (190–0 cm, after ca. 0.6 ka). These findings suggest that overbank deposits correspond to strengthened hydrodynamic conditions at the flood-peak stage. Furthermore, the indicative pollen and spores provide compelling evidence for intensifying human impact in the North China Plain since the late Holocene. An aggregation of Selaginella sinensis at the depth of 640–610 cm indicates deforestation in the uplands since ca. 2.9 ka. Similarly, a sharp increase in Malvaceae percentage at the depth of 285–215 supports historical records of initial cotton planting in the Tang Dynasty (ca. 1.4–1.1 ka). The study underscores the value of palynological analysis for reconstructing paleoenvironment and human-environment interactions, providing a robust framework for understanding landscape evolution in the North China Plain.

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Section: Implications For Pollen-based Anthropogenic Impactsmentioning

confidence: 60%

Holocene flood records and human impacts implied from the pollen evidence in the Daming area, North China Plain

Yang,

Liu,

Roberts

et al. 2024

Front. Earth Sci.

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“…Plant leaf senescence is coordinated with root growth [16], and canopy growth directly reflects the quality of root growth. In this experiment, the leaf area index (LAI) of the population at each stage of filmless cotton was in the order of boll stage > full bloom stage > boll opening stage > bud stage, and its root index showed a corresponding trend.…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Drip Irrigation Rates on Root Distribution Characteristics and Yield of Cotton under Mulch-Free Cultivation in Southern Xinjiang

Wan,

Li,

Wang

et al. 2024

Water

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In order to study the effects of different irrigation amounts on the root characteristics and yield of cotton without film mulching (abbreviated as filmless cotton) under drip irrigation in Southern Xinjiang, five irrigation amounts of filmless cotton (300, 375, 450, 525 and 600 mm, represented by W1, W2, W3, W4 and W5) and one irrigation amount of cotton with film mulching (abbreviated as filmed cotton) (450 mm, represented by WCK) were set. The effects of irrigation amount on root length density (RLD), root surface area (RSA), root average diameter (RAD), root volume (RV), root weight density (RED) and yield of filmless cotton were analyzed. The results of the two-year experiment showed the following: (1) The indexes of cotton root growth reached the maximum at the flowering and bolling stage, and the growth of soil root in the periphery (30 cm from the main root) and the lower layer (40–60 cm soil layer) reached the peak at the flowering and bolling stages, respectively; (2) The average value of root growth index of film-free cotton in each treatment was W2 > W3 > W4 > W5 and W1. The RLD of W2 and W3 increased by 19.41–106.67% and 13.66–84.22% in the peripheral and lower soil layer, and the proportion of RSA in the peripheral and middle soil layer (20–40 cm soil layer) increased by 1.64–3.41% and 0.49–4.09% compared with other treatments. The RAD, RV and RWD after W2 treatment were relatively large at various distribution points in the soil, followed by W3 treatment; (3) The average root indexes of WCK were not significantly different from those of W3, but the indexes of the lower soil layer were the smallest, at only 29.18–66.84% of the average value of the non-film mulching treatment, while the root indexes of the surface layer (0–20 cm soil layer) and the surrounding soil were larger, with an increase of 11.43–102.17% and 29.60–111.57%, respectively, compared with the non-film mulching treatment; (4) The seed cotton yield of W3 was the highest in the non-film mulching treatment, reaching 4833.25 kg·hm−2, but was still lower than that of WCK by 27.79%. Conclusion: An appropriate water deficit is conducive to root growth and increases the uniformity of its distribution in the soil layer. The irrigation amount of 375–450 mm for filmless cotton in Southern Xinjiang can promote root growth, prevent senescence and increase yield, which can be used as a reference in production.

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Effects of diethyl aminoethyl hexanoate on the physiology and selenium absorption of grape seedlings

et al. 2021

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Coordination of root growth and leaf senescence in cotton

Cited by 3 publications

References 8 publications

Holocene flood records and human impacts implied from the pollen evidence in the Daming area, North China Plain

Holocene flood records and human impacts implied from the pollen evidence in the Daming area, North China Plain

Effects of Different Drip Irrigation Rates on Root Distribution Characteristics and Yield of Cotton under Mulch-Free Cultivation in Southern Xinjiang

Effects of diethyl aminoethyl hexanoate on the physiology and selenium absorption of grape seedlings

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