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[47], 'reproduce': [48], 'exclusively': [49], 'vegetative': [51], 'propagation': [52], '(planting': [53], 'tubers).': [55], 'These': [56], 'varieties': [57], 'are': [58, 122, 134], 'either': [59], 'sterile': [60], 'produce': [62], 'sparse': [63], 'irregular': [65], 'flowering': [66, 153], 'with': [67], 'high': [68], 'flower': [69, 144], 'abortion': [70], 'rate,': [71], 'low': [72], 'fruit': [73], 'seed': [75], 'set.': [76], 'Production': [77], 'crossbreed': [79], 'seeds': [80], 'genetic': [82, 87, 128], 'improvement': [83], 'maintaining': [86], 'diversity': [88], 'yams': [90], 'is,': [91], 'therefore,': [92, 150], 'mainly': [93], 'achieved': [94], 'through': [95], 'natural': [96], 'managed': [98], 'pollination.': [99, 147], 'Flowering': [100, 111], 'yam': [102, 131, 143, 163], 'mostly': [104], 'dioecious': [105], 'and,': [106], 'some': [108], 'instances,': [109], 'monoecious.': [110], 'asynchrony,': [112], 'sticky': [113], 'nature': [114], 'pollen': [117], 'grains,': [118], 'cross': [120], 'incompatibility': [121], 'among': [123], 'challenges': [125], 'making': [127], 'progress': [129], 'breeding.': [132], 'There': [133], 'limitations': [136], 'basic': [138], 'applied': [140], 'knowledge': [141], 'biology': [145], 'This': [148], 'paper,': [149], 'reviews': [151], 'biology,': [154], 'pollination,': [155], 'methods': [157], 'improving': [159], 'pollination': [160], 'efficiency': [161], 'breeding': [164], 'programs.': [165]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W3099009037', 'counts_by_year': [{'year': 2024, 'cited_by_count': 4}, {'year': 2023, 'cited_by_count': 7}, {'year': 2022, 'cited_by_count': 15}, {'year': 2021, 'cited_by_count': 5}], 'updated_date': '2024-09-19T17:35:11.195583', 'created_date': '2020-11-23'}